You are presented with the question "what were formed by rock folding?" and the following answer choices: 
- patch reefs
 - Sand dollars
 - carbon emissions
 - oceans
 - calcite
 - h2o vapor
 - permineralization
 - big mountains

Now knowing that the Himalayas were formed by rock folding and for big mountain background, check out the Himalayas , choose the best answer.


 

        big mountains 