You are presented with the question "chemical weathering causes iron to oxidize in what?" and the following answer choices: 
- calcite
 - limestone
 - In sediment
 - the skin
 - graptolites
 - loose soil
 - body water
 - soils

Now knowing that chemical weathering causes iron in rock to oxidize and limestone is a fairly common rock type, choose the best answer.


 

  limestone       