If silver jewelry could not be made without igneous intrusion, then what geological formation must occur for the availability of material for silver jewelry to occur?

Answer choices:
- Igneous intrusion
 - Metamorphic Layers
 - loose soil
 - tectonic plates coliding
 - Physical weathering
 - Volcanic mountains
 - permineralization
 - Sedimentary deposits

 

 Igneous intrusion         