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| a layer of rock or sediment that allows water to flow |
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| quantities or factors in an experiment that the scientist keeps the same so that the experiment is fair, accurate or comparable |
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| it is the variable that is measured, observed or counted and changes in response to the independent variable |
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| a huge mass of ice slowly flowing over land formed from compacted snow |
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| water beneath the earth's surface in saturated soil and rock |
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| a perennial covering of ice on a mountaintop or arctic island |
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| the entire body of salty water that covers 70% of the earth's surface |
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| the variable that is changed by the scientist. there is only one independent variable in an experiment |
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| the movement of water from the ocean to the atmosphere to the land and back to the ocean |
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