You are presented with the question "where are vein deposits of gold and silver formed?" and the following answer choices: 
- clouds
 - graptolites
 - underground
 - patch reefs
 - plants
 - calcite
 - platinum
 - soft soil

Now knowing that vein deposits of gold and silver are formed by igneous intrusion and intrusive igneous rocks form underground, choose the best answer.


 

   underground      