Five birds taking flight from a tree.

Birds

Five birds taking flight from a tree.

In Norse mythology, Mani drives the moon chariot at night. He finds a boy and a girl carrying a pail of water. He takes them for a ride in his chariot.

Children in the Moon

In Norse mythology, Mani drives the moon chariot at night. He finds a boy and a girl carrying a pail…

This illustration shows three different views of the De Haviland 4 Reconnaissance Plane. This plane has a 400 horsepower Liberty Engine.

De Haviland 4 Reconnaissance Plane

This illustration shows three different views of the De Haviland 4 Reconnaissance Plane. This plane…

A giant ealge flies while holding Gulliver's little box, taking him over the sea.

Flying Eagle

A giant ealge flies while holding Gulliver's little box, taking him over the sea.

Osmington, Near Weymouth, a painting by John Constable.

Osmington, Near Weymouth

Osmington, Near Weymouth, a painting by John Constable.

The word "parachute" comes from "para", meaning "against" or "counter" in Ancient Greek, and "chute", the French word for "fall". Some modern parachutes are classified as semi-rigid wings, which are maneuverable and can make a controlled descent to break on impact with the ground.

DrogueParachute

The word "parachute" comes from "para", meaning "against" or "counter" in Ancient Greek, and "chute",…

Cirrus cloud is a type of cloud composed of ice crystals and characterized by thin, wisplike strands, often accompanied by tufts. A Cumulus cloud is a cloud belonging to a class characterized by puffs, mounds or towers, with flat bases and tops that often resemble cauliflower.

Primary Forms of Clouds: Cirrus and Cumulus

Cirrus cloud is a type of cloud composed of ice crystals and characterized by thin, wisplike strands,…

A Nimbus, or Storm Cloud, is any cloud from which rain falls. The Stratus, or Layer Clouds, form in long, horizontal sheets or bands. These clouds are most common in the early morning or evening, when the ascending currents are weak.

Primary Forms of Clouds: Nimbus and Stratus

A Nimbus, or Storm Cloud, is any cloud from which rain falls. The Stratus, or Layer Clouds, form in…

The wind is supposed to rotate as in a cyclone, only the axis of the whirl is horizontal instead of vertical. Two horizontal layers of cloud exist-the upper layer of snow, the lower, or rain. The snowflakes, which form the nuclei of the hailstones, are caught in the whirl, are dipped in rapid succession into the two clouds, thus receiving alternate coatings of ice and snow, until at last they are hurried to the ground.

Rotary Theory of Hail

The wind is supposed to rotate as in a cyclone, only the axis of the whirl is horizontal instead of…

Salisbury Cathedral (From the Meadows), a painting by John Constable exhibited in 1831.

Salisbury Cathedral (From the Meadows)

Salisbury Cathedral (From the Meadows), a painting by John Constable exhibited in 1831.

Cirro-Cumulus is formed from cirrus or cirrostratus clouds when they are warmed gently from below. Cirro-Stratus clouds appear as whitish and usually somewhat fibrous veils, often covering the whole sky and sometimes so thin as to be hardly discernible. The Cumulo-Stratus is the form produced by the heaping together of a mountain-like mass of cumulus clouds.

Secondary Forms of Clouds

Cirro-Cumulus is formed from cirrus or cirrostratus clouds when they are warmed gently from below. Cirro-Stratus…

The sky-lark (or field-ark) is one of the most celebrated songbirds of England.

Skylarks

The sky-lark (or field-ark) is one of the most celebrated songbirds of England.

Concentric layers, similar to those of an onion, will be noticed, arranged around a central nucleus, sometimes of ice and sometimes of snow, through generally the latter. The stones are more or less oblately spheroidal in shape. Their general weight varies from a few grains to several ounces, but they have been known to way several pounds.

Structure of a Hailstone

Concentric layers, similar to those of an onion, will be noticed, arranged around a central nucleus,…

An illustration of a woman reaching towards the sky.

Woman Reaching to Sky

An illustration of a woman reaching towards the sky.

The leader of all the other gods in Greek mythology. He is the god of the sky and thunder.

Zeus

The leader of all the other gods in Greek mythology. He is the god of the sky and thunder.