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science exam emily
science study stack for science exam 2011
| Question | Answer |
|---|---|
| the gradual process of change that helps a community or ecosystem achieve stability or balance | succession |
| type of succession that starts from lava,bare rock,glacier movement. | primary sucession |
| starts with a disturbance where a ecosytem already exists | secondary succession |
| how do lichen and mosses get energy? | from the sun |
| name the stages of primary succession A. volcanic eruption B.trees C. lichens and moss D. grasses and shrubs E. animals and trees | a c d b e |
| what is the breaking apart of rocks into smaller pieces | weathering |
| movement of rock and sediment | erosion |
| list three agents of erosion | wind water and gravity |
| what process creates deltas | depositions |
| when sand blown particles hit the surface of rock it slowly wears it down this is an example of | weathering |
| weathering that breaks rocks by phisical weathering such as ice wedging is called | physical weathering |
| weathering that breaks down rocks by chemical force is called | chemical weathering |
| water located within rocks below earths surface is called | ground water |
| when a place is in a drought what happens to the ground water | the groundwater levels decrease |
| how does an aduifer get recharged | when it rains |
| what occurs when water goes through rock and soild into groundwater | perculation |
| a rock that dosent allow water to pass through is called | impermeable |
| how is surface water replaced | with rain and groundwatrer |
| what is caused by a lack of percipitation | drought |
| list three ways a flood can effect an ecosystem | drowning animals,moving animals and taking away soil. |