You are presented with the question "What geological formation must occur for the availability of material for silver jewelry to occur?" and the following answer choices: 
- Igneous intrusion
 - Metamorphic Layers
 - loose soil
 - tectonic plates coliding
 - Physical weathering
 - Volcanic mountains
 - permineralization
 - Sedimentary deposits

Now knowing that vein deposits of gold and silver are formed by igneous intrusion and jewelry is made of silver, gold or platinum and is usually set with precious stones, choose the best answer.


 

 Igneous intrusion        