Final answer:
Mountains and volcanoes on Earth's surface are a result of the movement of tectonic plates.
Step-by-step explanation:
Many of the geographic features on Earth's surface, such as mountains and volcanoes, are a result of the movement of tectonic plates. Tectonic plates are large pieces of the Earth's lithosphere that float on the semi-fluid asthenosphere below. These plates move due to the convection currents in the asthenosphere, causing them to collide, separate, or slide past each other.
Learn more about Tectonic plates