Fact 1: Vein deposits of gold and silver are formed by igneous intrusion.

Fact 2: Along with gold and silver, they are known as precious or noble metals.

Given the two facts above, answer the question "igneous intrusion causes vein deposits of what?" with the following options: 
- Sediment
 - diamonds
 - water
 - precious metals
 - oil
 - Calcium carbonate
 - graptolites
 - hydrogen and oxygen


 

    precious metals     