Chemistry, 02.01.2020 22:31 ayalat9596

about 21% of earth's atmosphere is composed of oxygen. oxygen can combine with other substances. the chemical reaction of oxygen with other substances is called oxidation and it is a source of chemical weathering. the building on the left has undergone oxidation. compare the picture on the left with the picture on the right. the building has changed. the rock has changed much like the building.

describe how the rock on the right has changed over time.

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