Vein deposits of gold and silver are formed by igneous intrusion, and if magma solidifies within the crust, the rock is called an intrusive igneous rock. Given these facts, what does magma form among the following options:
- It gets heated up
 - movement of tectonic plates
 - objects that have mass
 - vein deposits of gold
 - fissures of hot, acidic water
 - adding heat
 - tectonic plates coliding
 - heating liquids


 

    vein deposits of gold     