You are presented with the question "When do vein deposits of gold and silver form?" and the following answer choices: 
- When magma warms up
 - flow of electrons
 - it can be seen
 - permineralization
 - When magma cools
 - aqueous solution
 - When the air is cold
 - When water rises

Now knowing that vein deposits of gold and silver are formed by igneous intrusion and magma that cools slowly deep below the surface produces coarse-grained intrusive igneous rocks, choose the best answer.


 

     When magma cools    