Fact 1: Chemical weathering causes iron in rock to oxidize.

Fact 2: Chemical weathering is the chemical disintigration of rocks.

Given the two facts above, answer the question "what causes iron in rocks to oxidize?" with the following options: 
- a tree falling
 - oxidation reaction
 - exposure to cold
 - chemical disintegration
 - hydrogen and oxygen
 - basic building blocks of life
 - fissures of hot, acidic water
 - flow of electrons


 

    chemical disintegration     