Fact 1: Sedimentary rocks are formed by deposition.

Fact 2: Sandstones are another type of sedimentary rocks used in buildings.

Given the two facts above, answer the question "what is formed by deposition?" with the following options: 
- calcite
 - coral reefs
 - h2o
 - oxygen
 - sandstones
 - soft soil
 - clouds
 - Sand dollars


 

     sandstones    