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| the study of objects beyond earth's atmosphere |
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| science that studies the air that surrounds our planet |
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| study of materials that make up earth and the processes that from and change these materials |
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| rigid outer shell of the planet that includes the crust and the solid, uppermost part of the layer below the crust, the mantle |
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| earth's oceans, seas, lakes, rivers and glaciers, as well as the water in the atmosphere |
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| blanket of gases that surround our planet |
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| includes all organisms on earth as well as the enviornments in which they live |
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| circles halfway between the north and south poles |
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| distance in degrees north or south of the euqator |
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| distance in degrees east and wst of the prime meridian |
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| imaginary line representing zero degrees longitude. runs from the north pole through Greenwich, England to the south pole. |
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| 180 degree median, serves as a transition line for calendar days. |
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| map that has parallel lines of latitude and longitude |
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| made by projection points and lines from a globe onto a cone |
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| made by projecting points and lines from a globe onto a piece of paper that touches the globe at a single point |
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| detailed maps showing the hills and valleys of an area |
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| connects points of equal elevation |
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| difference in elevation between two-side-by-side contour lines |
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| explains what the symbols on the map represent |
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| the ratio between distances on a map and actual distances on the surface of the earth |
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