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| One of seven large landmasses on the Earth's surface. |
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| A large rigid section of the Earth's crust that is in constant motion. |
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| A sudden movement of the Earth's crust followed by a series of shocks. |
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| A zone of volcanos around the the pacific ocean. |
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| An opening in Earth's crust from which molten rock, ash, and hot gases flow are thrown out. |
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| A gradual physical and chemical break down of rocks on the Earth;s surface. |
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| The wearing away of movement of weathered materials by water, wind, or ice. |
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| Peices of rock in the form of sand, stone. or silt deposited by the wind, water, or ice. |
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| A large, slow moving mass of ice. |
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| The area drained by a major river. |
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| Water found beneath the Earth's surface |
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| The circulation of water between the Earth's. the oceans, and the atmosphere. |
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| A feature on the Earh's surface formed by a physical force. |
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| A broad, flay asrea of land higher than the surrounding land. |
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| The difference in the elevation of a landform from its lowest point to its highest point. |
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| The submerged land at the edge of the continent. |
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| The layer of gases that surriound the Earth. |
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| The time during the year when the sun reaches the farthest northern or southern point in the sky. |
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| One of the times a year when the sun's rays are over the equater and days and night around the world are equal length. |
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| The condition of the Earth's atmosphere at a given time and place. |
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| The typical waetjer conditions of a region over a long period of time. |
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| Falling water droplets in form of rain, snow, sleet, and hail. |
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| An area that has similar plants. |
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| A vegetation region with a mix of grass and and scattered trees. |
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| A region with the plants specially adapted to dry condtions. |
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| An increase in the average tempature of the Earth's atmosphere. |
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| The trapping of the sun's heat by gasas in the Earth's atmosphere. |
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| Any gas in the atmosphere that contributes to the greenhouse effect. |
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| Fuels such as coal, oil, and natural gas. |
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| The process in which farmland becomes less productive because the land is degraded. |
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| Using natural resouces in a way that they exist for future generations. |
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| A gas composed of carbon and oxygen. |
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| Subtances discharged into the air. |
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