Fact 1: The Himalayas were formed by rock folding.

Fact 2: For big mountain background, check out the Himalayas .

Given the two facts above, answer the question "what were formed by rock folding?" with the following options: 
- patch reefs
 - Sand dollars
 - carbon emissions
 - oceans
 - calcite
 - h2o vapor
 - permineralization
 - big mountains


 

        big mountains 