You are presented with the quiz "chemical weathering causes what to change to limonite" 

But you don't know the answer, so you turn to your teacher to ask for hints. He says that "chemical weathering causes iron in rock to oxidize" and "also pyrite within the altered wall rock is oxidized to limonite, geothite and hematite". 

So, what's the best answer to the question?


 

 pyrite          