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An illustration of duckweed. Duckweed is an important food source for waterfowl and are eaten by humans in some parts of Southeast Asia (as khai-nam). Some duckweeds are used in freshwater aquariums and ponds where they may spread rapidly, although in a large pond they may be difficult to eradicate once established. The plants can provide nitrate removal (if cropped) and cover for fry. The plants are used as shelter by pond water species, such as bullfrogs and bluegills. The duckweeds are important in the process of bioremediation because they grow rapidly, absorbing excess mineral nutrients, particularly nitrogen and phosphates. A cover of duckweeds will reduce evaporation of water compared to a clear surface.

Duckweed

An illustration of duckweed. Duckweed is an important food source for waterfowl and are eaten by humans…

A very lively group of people at the fair. A marching band plays, children ride the merry-go-round, and a fountain sprays water high into the air.

Fair

A very lively group of people at the fair. A marching band plays, children ride the merry-go-round,…

The Northern Shoveler (Anas clypeata) is a common duck in the Anatidae family of water birds.

Northern Shoveler

The Northern Shoveler (Anas clypeata) is a common duck in the Anatidae family of water birds.

An illustration of a simple five armed crinoid with a detailed view of the tegmen of five orals. Crinoids, also known as sea lilies or feather-stars, are marine animals that make up the class Crinoidea of the echinoderms (phylum Echinodermata). They live both in shallow water and in depths as great as 6,000 meters. Crinoids are characterized by a mouth on the top surface that is surrounded by feeding arms. They have a U-shaped gut, and their anus is located next to the mouth.

Simple Crinoid

An illustration of a simple five armed crinoid with a detailed view of the tegmen of five orals. Crinoids,…

The American Water Shrew (Sorex palustris) is a small mammal in the Soricidae family of shrews that is found in aquatic habitats.

American Water Shrew

The American Water Shrew (Sorex palustris) is a small mammal in the Soricidae family of shrews that…

A boy and a girl wading in a river.

Children Wading in a River

A boy and a girl wading in a river.

Two boys pumping water into a trough.

Boys Pumping Water

Two boys pumping water into a trough.

An illustration of a white water lily and the transition from petals to stamens.

White Water Lily

An illustration of a white water lily and the transition from petals to stamens.

Sedum is the large stonecrop genus of the Crassulaceae, representing about 400 species of leaf succulents, found throughout the northern hemisphere, varying from annual and creeping herbs to shrubs. The plants have water-storing leaves. The flowers usually have five petals, seldom four or six. There are typically twice as many stamens as petals.

Sedum

Sedum is the large stonecrop genus of the Crassulaceae, representing about 400 species of leaf succulents,…

Crayfish, crawfish, or crawdads are freshwater crustaceans resembling small lobsters, to which they are probably closely related. They breathe through feather-like gills and are found in bodies of water that do not freeze to the bottom; they are also mostly found in brooks and streams where there is fresh water running, and which have shelter against predators. Most crayfish cannot tolerate polluted water, although some species such as the invasive Procambarus clarkii are more hardy. Some crayfish have been found living as much as 3 m (10 feet) underground.

Crayfish

Crayfish, crawfish, or crawdads are freshwater crustaceans resembling small lobsters, to which they…

"Hawser-rudder. a, hawser; bb, hauling-lines, leading through chocks on each quarter." -Whitney, 1911

Hawser Rudder

"Hawser-rudder. a, hawser; bb, hauling-lines, leading through chocks on each quarter." -Whitney, 1911

The Lotus flower is an Indian water lily.

Lotus Flower

The Lotus flower is an Indian water lily.

The Exterior Scallop Shell was used as a water basin in the form of a shallow dish and as a decorative background for vases and busts. It was extensively used during the later Renaissance.

Exterior Scallop Shell

The Exterior Scallop Shell was used as a water basin in the form of a shallow dish and as a decorative…

The Interior Scallop Shell was used as a water basin in the form of a shallow dish and as a decorative background for vases and busts. It was extensively used during the later Renaissance.

Interior Scallop Shell

The Interior Scallop Shell was used as a water basin in the form of a shallow dish and as a decorative…

The Greek hydria link border is a design found on the outside of a Greek pottery used for carrying water. It is a scroll design of leaves connected like a chain.

Greek Hydria Link Border

The Greek hydria link border is a design found on the outside of a Greek pottery used for carrying water.…

The Holy water-stoup candelabrum-like shaft is an Italian Renaissance design that is found in the Pisa Cathedral.

Holy Water-Stoup Candelabrum-like Shaft

The Holy water-stoup candelabrum-like shaft is an Italian Renaissance design that is found in the Pisa…

This wrought-iron bracket is a German Renaissance style. It is a bearer of a water-stoup, found on a sepulchral cross in a cemetery in Kirchzarten, Germany.

Wrought-Iron Bracket

This wrought-iron bracket is a German Renaissance style. It is a bearer of a water-stoup, found on a…

An illustration of the partial inflorescence of a cyperus plant, spikelet of the same (left), and the flower (right). Cyperus is a large genus of about 600 species of sedges, distributed throughout all continents in both tropical and temperate regions. They are annual or perennial plants, mostly aquatic and growing in still or slow-moving water up to 0.5 m deep. The species vary greatly in size, with small species only 5 cm tall, while others can reach 5 m in height. Common names include papyrus sedges, flatsedges, nutsedges, umbrella-sedges and "galingales"

Cyperus

An illustration of the partial inflorescence of a cyperus plant, spikelet of the same (left), and the…

Darlingtonia californica also called the California Pitcher plant, Cobra Lily, or Cobra Plant, is a carnivorous plant, the sole member of the genus Darlingtonia in the family Sarraceniaceae. It is native to Northern California and Oregon, growing in bogs and seeps with cold running water. This plant is designated as uncommon due to its rarity in the field.

Darlingtonia Californica

Darlingtonia californica also called the California Pitcher plant, Cobra Lily, or Cobra Plant, is a…

A pottery model of the water organ. The water organ or hydraulic organ (early types are sometimes called hydraulis, hydraulos, hydraulus or hydraula) is a type of automatic pipe organ blown by air, where the power source pushing the air is derived by water from a natural source (e.g. by a waterfall) or by a manual pump. Consequently, the water organ lacks a bellows, blower, or compressor. In addition to being the source of power to push air through the organ pipes, the water is also used as a source of power to drive a mechanism similar to that of the Barrel organ, which has a pinned barrel that contains a specific song to be played.

Pottery Model of the Water Organ

A pottery model of the water organ. The water organ or hydraulic organ (early types are sometimes called…

A pottery model of the water organ. The water organ or hydraulic organ (early types are sometimes called hydraulis, hydraulos, hydraulus or hydraula) is a type of automatic pipe organ blown by air, where the power source pushing the air is derived by water from a natural source (e.g. by a waterfall) or by a manual pump. Consequently, the water organ lacks a bellows, blower, or compressor. In addition to being the source of power to push air through the organ pipes, the water is also used as a source of power to drive a mechanism similar to that of the Barrel organ, which has a pinned barrel that contains a specific song to be played.

Pottery Model of the Water Organ

A pottery model of the water organ. The water organ or hydraulic organ (early types are sometimes called…

The water organ or hydraulic organ (early types are sometimes called hydraulis, hydraulos, hydraulus or hydraula) is a type of automatic pipe organ blown by air, where the power source pushing the air is derived by water from a natural source (e.g. by a waterfall) or by a manual pump. Consequently, the water organ lacks a bellows, blower, or compressor. In addition to being the source of power to push air through the organ pipes, the water is also used as a source of power to drive a mechanism similar to that of the Barrel organ, which has a pinned barrel that contains a specific song to be played.

Water Organ

The water organ or hydraulic organ (early types are sometimes called hydraulis, hydraulos, hydraulus…

Used as a form of humiliating punishment for angry women, a ducking stool was "a stool or chair in which common scolds were formerly tied and plunged into water." -Whitney, 1911

Ducking Stool

Used as a form of humiliating punishment for angry women, a ducking stool was "a stool or chair in which…

The wels catfish is a scaleless fresh and brackish water catfish recognizable by its broad, flat head and wide mouth. The mouth contains lines of numerous small teeth, two long barbels on the upper jaw and four shorter barbels on the lower jaw. It has a long anal fin that extends to the caudal fin, and a small sharp dorsal fin positioned relatively far forward. It uses its sharp pectoral fins to capture prey. With these fins, it creates an eddy to disorient its victim, which it then simply engulfs in its enormous throat. It has very slippery green-brown skin. Its belly is pale yellow or white. Wels catfish can live for at least thirty years and have very good hearing.

Wels Catfish

The wels catfish is a scaleless fresh and brackish water catfish recognizable by its broad, flat head…

The cephalopods are the mollusk class Cephalopoda characterized by bilateral body symmetry, a prominent head, and a modification of the mollusk foot, a muscular hydrostat, into the form of arms or tentacles. Teuthology, a branch of malacology, is the study of cephalopods. The class contains two extant subclasses. In the Coleoidea, the mollusk shell has been internalized or is absent; this subclass includes the octopuses, squid, and cuttlefish. In the Nautiloidea the shell remains; this subclass includes the nautilus. About 786 distinct living species of cephalopods have been identified. Two important extinct taxa are Ammonoidea, the ammonites, and Belemnoidea, the belemnites Cephalopods are found in all the oceans of Earth, at all depths. None of them can tolerate freshwater, but a few species tolerate more or less brackish water.

Cephalopod

The cephalopods are the mollusk class Cephalopoda characterized by bilateral body symmetry, a prominent…

A hydria is a type of Greek pottery used for carrying water. The hydria has three handles. Two horizontal handles on either side of the body of the pot were used for lifting and carrying the pot. The third handle, a vertical one, located in the center of the other two handles, was used when pouring water. This water vessel can be found in both the red and black figure pottery styles. They often depicted scenes of Greek mythology, that reflected moral and social obligations.

Hydria

A hydria is a type of Greek pottery used for carrying water. The hydria has three handles. Two horizontal…

"Part of a Roman Aqueduct. Aqueducts form one of the most characteristic features of Roman architecture. Although these simple successions of gigantic arches, which stretch for miles, have no pretensions to artistic beauty, yet their wonderful size and extent bear witness to the vast conceptions of Roman genius."

Roman Aqueduct

"Part of a Roman Aqueduct. Aqueducts form one of the most characteristic features of Roman architecture.…

A hydrometer is an instrument used to measure the specific gravity (or relative density) of liquids; that is, the ratio of the density of the liquid to the density of water. A hydrometer is usually made of glass and consists of a cylindrical stem and a bulb weighted with mercury or lead shot to make it float upright. The liquid to be tested is poured into a tall jar, and the hydrometer is gently lowered into the liquid until it floats freely. The point at which the surface of the liquid touches the stem of the hydrometer is noted. Hydrometers usually contain a paper scale inside the stem, so that the specific gravity can be read directly.

Common Hydrometer

A hydrometer is an instrument used to measure the specific gravity (or relative density) of liquids;…

"Suppose we have a pipe A B laid in a horizontal position so that the centre line is exactly at the same level all along the pope, and differences of level may be neglected. Let water be delivered b this pipe at a steady from a reservoir provided with a constant supply which keeps the free surface level always the same. If the pipe A B is of uniform sectional area throughout, and is at all points offers a uniform frictional resistance to the flow of the water, the pressure will gradually become less at points along it more and more distanct from the reservoir. This is no lonfer the case when the pipe is larger at one place than another, as shown in the [figure]." (Britannica, 1891)

Water Flow in Pipes

"Suppose we have a pipe A B laid in a horizontal position so that the centre line is exactly at the…

Lemnaceae is a family of flowering plants, also known as the duckweed family, as it contains the duckweeds or water lentils. Since duckweeds are now considered to be a branch of the arum or aroid family (Araceae), the name 'Lemnaceae' is rapidly falling out of use among taxonomists, who treat it as a subfamily called Lemnoideae.

Lemnaoideae

Lemnaceae is a family of flowering plants, also known as the duckweed family, as it contains the duckweeds…

An illustration of a simple dam; a dam is a barrier that impounds water or underground streams. Dams generally serve the primary purpose of retaining water, while other structures such as floodgates, levees, and dikes are used to manage or prevent water flow into specific land regions.

Simple Dam

An illustration of a simple dam; a dam is a barrier that impounds water or underground streams. Dams…

This Egyptian amphora is a vase with a cover intended for water, oil or wine. It was found in Thebes, Ancient Egypt, part of the Thutmose III pharaoh of the eighteenth dynasty.

Egyptian Amphora Shape

This Egyptian amphora is a vase with a cover intended for water, oil or wine. It was found in Thebes,…

This Egyptian amphora is a vase with a cover intended for water, oil or wine. It was found in Thebes, Ancient Egypt, part of the twentieth dynasty.

Egyptian Amphora

This Egyptian amphora is a vase with a cover intended for water, oil or wine. It was found in Thebes,…

The Egyptian Krater is an antique vase that has a lotus cup design. Typically used for mixing water and wine.

Egyptian Krater

The Egyptian Krater is an antique vase that has a lotus cup design. Typically used for mixing water…

This Egyptian Krater is an antique vase that was found in Thebes, Ancient Egypt during the eighteenth dynasty. Typically used for mixing water and wine.

Egyptian Krater from Thebes

This Egyptian Krater is an antique vase that was found in Thebes, Ancient Egypt during the eighteenth…

This Greek krater is a type of antique vase that was typically used for mixing water and wine.

Greek Krater

This Greek krater is a type of antique vase that was typically used for mixing water and wine.

This Greek krater is a type of antique vase that was typically used for mixing water and wine.

Greek Krater

This Greek krater is a type of antique vase that was typically used for mixing water and wine.

This Greek krater has columnar handles. Its a type of antique vase that was typically used for mixing water and wine.

Greek Krater

This Greek krater has columnar handles. Its a type of antique vase that was typically used for mixing…

This Greek Krater has volute handles that spiral upwards. Its a type of antique vase that was typically used for mixing water and wine.

Greek Krater

This Greek Krater has volute handles that spiral upwards. Its a type of antique vase that was typically…

This antique krater is an antique vase that was typically used for mixing water and wine.

Antique Krater

This antique krater is an antique vase that was typically used for mixing water and wine.

This Antique krater is found in Tivoli, England. Typically used for mixing water and wine.

Antique Krater

This Antique krater is found in Tivoli, England. Typically used for mixing water and wine.

This modern flower-vase is a hyacinth glass which is intended for forcing bulbs into water.

Modern Flower-Vase

This modern flower-vase is a hyacinth glass which is intended for forcing bulbs into water.

This Romanesque stoup is used to hold holy water found in Roman Catholic churches.

Romanesque Stoup

This Romanesque stoup is used to hold holy water found in Roman Catholic churches.

This Romanesque stoup is used to hold holy water found in Roman Catholic churches.

Romanesque Stoup

This Romanesque stoup is used to hold holy water found in Roman Catholic churches.

This Romanesque stoup is used to hold holy water found in Roman Catholic churches.

Romanesque Stoup

This Romanesque stoup is used to hold holy water found in Roman Catholic churches.

This 12th century stoup is used to hold holy water. It is found in Roman Catholic churches.

12th Century Stoup

This 12th century stoup is used to hold holy water. It is found in Roman Catholic churches.

This 16th century stoup is used to hold holy water. It is found in Roman Catholic churches.

16th Century Stoup

This 16th century stoup is used to hold holy water. It is found in Roman Catholic churches.

This 17th century stoup is used to hold holy water. It is found in Roman Catholic churches.

17th Century Stoup

This 17th century stoup is used to hold holy water. It is found in Roman Catholic churches.

This church stoup is used to store holy water. It is found in Roman Catholic churches.

Church Stoup

This church stoup is used to store holy water. It is found in Roman Catholic churches.

This modern stoup is used to store holy water. It is found in Roman Catholic churches.

Modern Stoup

This modern stoup is used to store holy water. It is found in Roman Catholic churches.

This 16th century stoup is found in a chapel of a castle in Mello, France. It is used to store holy water.

16th Century Stoup

This 16th century stoup is found in a chapel of a castle in Mello, France. It is used to store holy…

This 17th century stoup is made out of silver. It is used to store holy water found in Roman Catholic churches.

17th Century Stoup

This 17th century stoup is made out of silver. It is used to store holy water found in Roman Catholic…

The Greek Hydria is used as a water-pot to carry water with from springs. Maidens carried it on their heads vertically when full and horizontally when empty.

Greek Hydria

The Greek Hydria is used as a water-pot to carry water with from springs. Maidens carried it on their…

This Greek Hydria has a Kalpis form that is smooth and painted in black and red figures on the shoulder. It is used as a water-pot to carry water from springs.

Greek Hydria

This Greek Hydria has a Kalpis form that is smooth and painted in black and red figures on the shoulder.…

This Greek Hydria is painted in black, reddish brown and white. Decorated of the highest class, the shoulder is decorated with an ivy band. It is used as a water-pot to carry water.

Greek Hydria

This Greek Hydria is painted in black, reddish brown and white. Decorated of the highest class, the…

This Egyptian bucket was found in Thebes, Ancient Egypt during the reign of Tutmose III. An Egyptian origin it was used to draw water from the Nile. This type of bucket was typically carried on a yoke (wooden beam between two oxens) to prevent spilling.

Egyptian Bucket from Thebes

This Egyptian bucket was found in Thebes, Ancient Egypt during the reign of Tutmose III. An Egyptian…

This Egyptian bucket is made out of bronze. An Egyptian origin it was used to draw water from the Nile. This type of bucket was typically carried on a yoke (wooden beam between two oxens) to prevent spilling.

Egyptian Bronze Bucket

This Egyptian bucket is made out of bronze. An Egyptian origin it was used to draw water from the Nile.…

This Egyptian bucket is made out of bronze. An Egyptian origin it was used to draw water from the Nile. This type of bucket was typically carried on a yoke (wooden beam between two oxens) to prevent spilling.

Egyptian Bucket

This Egyptian bucket is made out of bronze. An Egyptian origin it was used to draw water from the Nile.…

This Egyptian bucket is made out of bronze. An Egyptian origin it was used to draw water from the Nile. This type of bucket was typically carried on a yoke (wooden beam between two oxens) to prevent spilling.

Egyptian Bucket with Handle

This Egyptian bucket is made out of bronze. An Egyptian origin it was used to draw water from the Nile.…

This Egyptian vessel is bucket-like without a handle. It was used to transport water from the Nile.

Egyptian Vessel

This Egyptian vessel is bucket-like without a handle. It was used to transport water from the Nile.