Fact 1: Crumple means change shape from smooth into compacted by physical force.

Fact 2: Density increases with depth due to compaction and progressive cementation.

Given the two facts above, answer the question "Crumple means_  increases by physical force." with the following options: 
- threatened
 - mass
 - an object
 - density
 - movement
 - weight
 - volume
 - It expands


 

    density     