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

Fact 2: Also pyrite within the altered wall rock is oxidized to limonite, geothite and hematite.

Given the two facts above, answer the question "chemical weathering causes what to change to limonite" with the following options: 
- pyrite
 - growth
 - Collagen
 - fibrous
 - cellulose
 - soil
 - cracks
 - calcite


 

 pyrite        