Final answer:
The Earth's surface appears as it is today because of plate tectonics.
Step-by-step explanation:
The Earth's surface appears as it is today because of plate tectonics. Plate tectonics is the theory that the Earth's lithosphere (the outer layer of the Earth) is divided into several large plates that are constantly moving. This movement can result in various geological features, such as mountains, valleys, and oceans, which shape the Earth's surface over time.
Learn more about Plate Tectonics