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

Fact 2: Fe is the periodic symbol for Iron.

Given the two facts above, answer the question "Chemical weathering causes what in rock to oxidize?" with the following options: 
- Fe
 - tar
 - h2o
 - H20
 - DDT
 - Ag
 - O
 - CO2


 

 Fe        