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Geography |
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Contour Lines Contour lines never cross on the ground but in rare cases as an overhanging cliff they may cross on the map.... |
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Contour Lines A contour about to cross a stream runs up one side and down the other, making a V where it crosses, the angle of the V pointing up stream. Contour lines representing spurs between stream lines are gen... |
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Determining North The diagram shows how to determine North by sun and plumb line.... |
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Dune and Wind "Profile of a dune, from back to front, showing its relation to the wind. The flow-lines of air are drawn above, with the eddy in front of the dune." -Gilbert, 1910... |
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Dune Progress "Diagram of the progress of a dune, from a to be. The arrow flies with the wind. A live tree standing before the dune when it is at a will be buried by the advance to b. Another tree, previously kille... |
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Earth Curvature "The sun is so far away that it would appear at the same angle from Philadelphia, St. Louis, and Denver, and if it were noon at one of these places, it would be noon at the others. Vertical lines at t... |
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Fault "A fault is a fracture accompanied by displacement of the strata." -Dryer, 1901 ... |
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Fold, Eroded Anticline Eroded anticline... |
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Fold, Eroded Syncline Eroded syncline.... |
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Folds, Eroded Anticline Cross section of an eroded anticline.... |
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Folds, Eroded Syncline Cross section of an eroded syncline.... |
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Folds, Overthrust Anticline An overthrust anticline of a strata fold.... |
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Folds, Overthrust Anticline An overthrust anticline of a strata fold.... |
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Folds, Strata "A syncline is a downfolding of the strata in the form of a trough, as at a...An anticline is an upfolding of the strata in the form of an arch, as at b." -Dryer, 1901... |
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Globe An illustration with multiple instruments used for navigation. These items include a globe, compass, map and books.... |
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Globe This globe is a carved work of art. ... |
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Heliotrope An instrument used in geography to measure angles of the sun at different times of the day.... |
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Laccolite "Lava has been forced not only into vertical cracks, but also between the layers of stratified rock, where it has hardened and forms more or less horizontal sills. In some instances the quantity of li... |
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Meander, River A meander river with oxbow lakes. An oxbow lake is a U-shaped lake formed when a wide meander of a river is cut off.... |
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Mountains, Appalachian "At 1, a series of compressed folds has been worn down to a plain, the surface of which is formed by the edges of the nearly vertical strata. At 2 an anticline has been reduced to a valley, and at 3 a... |
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Polyconic Projection The development of polyconic projection: portraying a spherical object like the earth, on a flat surface.... |
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Sterogram, Mountain "Sterogram of Jura Mountains...The Jura Mountains in France and Switzerland consist of a series of parallel ridges and valleys in which each ridge is an anticline and each valley is a syncline." -Drye... |
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Sun Rays It is hotter at noon than at sunrise and sunset because there is a greater thickness of air for the horizontal sun rays to pass through at sunrise and sunset.... |
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Valley Development "By downward corrasion a stream cuts a steep-sided trench of its own width, but weathering, gravitation, and the wash of the rain widen it and make the sides sloping." a, a young V-shaped valley; b an... |
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Valley Development, Unequal "If the walls of the valley contain strata of unequal hardness, the form is modified by the projection of hard layers and the retreat of the softer ones." -Dryer, 1901... |
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