How do volcanoes change earth's surface?

Quick Answer. Volcanic eruptions involve the incursion of liquid magma into a physical environment, and the effects include major transformations, ranging from the formation of new land to the destruction of the viability of an existing environment. read more

Volcanoes can change the surface of the earth in several ways. The lava that is ejected for the volcano may dry and form a new layer of sediment on the ground. The chambers of magma underground can become too pressurized and make a whole new volcanic mountain. read more

The magma from lava comes up from the volcanoes and spreads over the earths surface. Explanation: Ok so the magma is in the volcano and it comes up, turning into lava which therefore hardens on the earth's surface after it spreads, turning into rock and adding on to the earth's surface. read more