Plate Tectonics

Earth's lithosphere is broken into sections called plates. They fit closely together along cracks in the crust, and so they carry both continents and parts of the ocean floor. They are in constant, slow motion driven by convection currents (Convection currents are circular currents or movement within a liquid or gas due to different densities of the hotter and cooler parts, so the magma move under the surface, pushing the plates) in the mental. The plates float on the top of the atmosphere and spread out beneath the lithosphere, making the movements of Earth's plates. They move about 1 cm per year! As they move, the produce changes in Earth's surface, like volcanoes, mountain ranges, and deep motion trenches. The edges of different plates, where they meet each other, are called plate boundaries. There are three types of plate boundaries - transform boundaries, divergent boundaries, and convergent boundaries.
(the following picture shows the different plates, when you click on it it becomes bigger)