The main effect of the biosphere on the chemistry of the Earth's crust has been to

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The biosphere has had a significant impact on the chemistry of the Earth's crust by creating an oxidizing atmosphere through photosynthesis. During photosynthesis, plants release oxygen into the atmosphere, which has allowed for the formation of oxidized minerals in the Earth's crust. Without the biosphere, the atmosphere would likely remain in a reducing state, preventing the formation of many important minerals.

The Main Effect of the Biosphere on the Chemistry of the Earth's