Global patterns of atmospheric movement influence local weather. Oceans have a major effect on climate, because water in the oceans hold a large amount of heat. Living have played many roles in the Earth system, including affecting the composition of the atmosphere and contributing to the weathering of rocks. The Earth processes we see today, including erosion, movement of crustal plates, and changes in atmospheric composition, are similar to those that occurred in the past. Earth history is also influenced by occasional catastrophes, such as the impact of an asteroid or comet.
Fossils provide important evidence of how life and environmental conditions have changed.
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