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Planet Earth Vocabulary List & Definitions

 

drought

an unusually prolonged lack of rain.
equator the imaginary circle around the earth's globe equidistant from both the North and South Poles.
erosion the process by which material from the earth's surface is worn away by forces such as glaciers, wind, and waves.
mantle the layer of the earth that lies between the crust and the core.
atmosphere the mass of gases surrounding the earth or any other celestial body.
ocean the vast expanse of salt water covering approximately three quarters of the earth's surface.
axis a straight line that serves as the unmoving center about which a body or figure turns.
ozone oxygen in the form of molecules with three atoms, created by exposure of oxygen to electrical discharge or ultraviolet radiation, having a sharp smell, and being an effective oxidant for use in bleaching and sterilizing.
revolution orbital motion around a given point.
rotation the act of turning on or around an axis.
terrain the natural surface features of a tract of land, esp. considered in relation to some use or activity.
core the center part of certain fruits, containing hard material and seeds.
crust the outer portion of the earth or other planet, or of a moon.

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