Magma reaches the surface by erupting through a volcano, which is a

mountain that forms in earth's crust when magma reaches the surface

Explanation:

this is a good question! i'll do some research and come back when i have the answer!

true. earthquakes are felt whenever there is a slip around a fault in the rocks below the earth. this reorientation of faults create sesmic waves and is known as earthquake, the severity of which is measured in richter scale. these are more prominent in hilly regions as the rocks usually form faults to balance the pressures on it.