You are presented with the question "contact between rocks over long periods of time causes rocks to be what?" and the following answer choices: 
- erosion
 - Loose
 - slippery
 - loose soil
 - homogenous
 - coiled
 - imbalanced
 - threatened

Now knowing that contact between rocks over long periods of time causes rocks to smooth and underfoot, loose rocks make footing perilous, while smooth marblelike stones make it slippery, choose the best answer.


 

   slippery      