Answer:
Explanation:
Ice cores can tell scientists about temperature, precipitation, atmospheric composition, volcanic activity, and even wind patterns. The thickness of each layer allows scientists to determine how much snow fell in the area during a particular year.
Answer:
Placer mining can be less damaging to the environment than surface mines, as the sediment is returned to the water after the minerals have been extracted.
Explanation:
Answer: oxygen
Explanation: It is oxygen because we always need oxygen for many things and organisms
Answer:
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Explanation:
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