Question

about 21% of earths 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. formulate how the rock on the right has changed over time. a chemical weathering has happened due to acid rain in the area. b oxygen has chemically reacted with minerals in the rock; oxidation has occurred. c water in the atmosphere has caused the rock to rust; it has physically weathered. d physical weathering has taken place and the rock is broken down into smaller pieces.

Explanation:

The text mentions that oxidation, a chemical reaction of oxygen with other substances, is a source of chemical weathering. The building on the left has undergone oxidation and the rock on the right has changed in a similar way. So, the rock has likely undergone oxidation due to the chemical reaction of oxygen with minerals in it.

Answer:

B. Oxygen has chemically reacted with minerals in the rock; oxidation has occurred.