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an organized group of parts that work together to form a whole |
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the mixture of gases and particles that surronds and protects the surface of the earth |
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all the water on Earth in oceans lakes glaciers rivers and streams and underground |
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all life on earth in the air on the land and in waters |
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all the features on earths surface |
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Definition
the use of scientific equipment to gather information about something from a distance |
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