Answer:
Intrusion of magma
Step-by-step explanation:
The main mechanism by which the rocks in the upper part of the earth's crust melt is known as the intrusion of magma. The intrusion of magma is any formation of intrusive igneous rock. The rock is formed from magma that cools and solidifies within the crust of the planet. This results in formations called lacoliths that are trapped beneath the surface of the earth and push the rock above it to form a dome shape.