You are presented with the question "vein deposits of gold and silver are formed where?" and the following answer choices: 
- loose soil
 - aqueous solution
 - graptolites
 - tectonic plates coliding
 - higher elevations
 - mountain sources
 - flow of electrons
 - In sediment

Now knowing that vein deposits of gold and silver are formed by igneous intrusion and intrusive igneous rocks account for sections of higher elevation, choose the best answer.


 

     higher elevations    