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| the whole mass of air surrounding the earth |
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| to convert into vapor; also : to dissipate or draw off in vapor or fumes |
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| either of the two times each year (as about March 21 and September 23) when the sun crosses the equator and day and night are everywhere of equal length |
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| the state of being eroded |
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| a large body of ice moving slowly down a slope or valley or spreading outward on a land surface |
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| a shaking or trembling of the earth that is volcanic or tectonic in origin |
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| an accumulation of earth and stones carried and finally deposited by a glacier |
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| falling off or shed seasonally or at a certain stage of development in the life cycle |
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| a fertile or green area in an arid region |
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| a water-bearing stratum of permeable rock, sand, or gravel |
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| to fracture so as to produce a geologic fault |
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| the conversion of a substance (as water) from the vapor state to a denser liquid or solid state usually initiated by a reduction in temperature of the vapor |
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| the process of growth or enlargement by a gradual buildup: as a : increase by external addition or accumulation |
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| a deposit on the earth of hail, mist, rain, sleet, or snow; also : the quantity of water deposited |
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| the action or process of the edge of one crustal plate descending below the edge of another |
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| a meteor particle itself without relation to the phenomena it produces when entering the earth's atmosphere |
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| a part of the ocean near the equator abounding in calms, squalls, and light shifting winds |
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| any of an order (Coniferales) of mostly evergreen trees and shrubs including forms (as pines) with true cones and others |
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| being in or facing the direction toward which the wind is blowing |
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| the solid part of a celestial body (as the earth); specifically : the outer part of the solid earth composed of rock essentially like that exposed at the surface and usually considered to be about 50 miles (80 kilometers) in thickness |
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