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

Fact 2: Gold and silver are valuable products.

Given the two facts above, answer the question "What does igneous intrusion create?" with the following options: 
- adding heat
 - loose soil
 - heat energy
 - Valuable products
 - hydrogen and oxygen
 - earthquakes
 - graptolites
 - objects that have mass


 

    Valuable products     