Answer:
Rocks are formed at convergent plate tectonics.
Step-by-step explanation:
- The 'movement of Earth's crust' through convection currents is known as Plate Tectonics.
- There are two types of plate tectonics- Convergent and Divergent plate boundaries.
- Divergent plate boundaries occur when the magma rises to the upper surface.
- Convergent plate boundaries occur when cooled rock - sedimentary rock becomes much denser and sinks back to the mantle of the Earth.
- Over a period of time, this crust melts and rises to the surface causing eruption of a volcano.