You are presented with the question "What can lead to oxidation of iron in rock?" and the following answer choices: 
- heat energy
 - low rainfall
 - flow of electrons
 - permineralization
 - fossil fuels
 - harmful substances
 - boiling
 - evaporation

Now knowing that chemical weathering causes iron in rock to oxidize and low rainfall means slow chemical weathering of rock, choose the best answer.


 

  low rainfall       