Describe where in nature you would see contaminated water actively weathering rocks and how it may differ from non-contaminated water.

The contaminated water contains harmful chemicals which results in the cracking of rock.

For example: The feldspar crystals within the granite react with the water chemically to form clay minerals which makes the rock weak and hence result in weathering.

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oxygen = 21% of the atmosphere

nitrogen = 78%

carbon dioxide = 0.1%

argon =0.934%