Plate tectonics is the theory that Earth's outer shell is divided into several plates that glide over the mantle, the rocky inner layer above the core. Plate tectonics explains the features and movement of Earth's surface in the present and the past, including volcanoes and earthquakes. The driving force behind plate tectonics is convection in the mantle. The types of plate boundaries include the following: divergent plate boundaries, convergent plate boundaries, and transform plate boundaries. Any area where two plates meet is a site of intense geologic activity. For your discussion please answer the following questions: 1. Explain the theories of continental drift, seafloor spreading, and plate tectonics. 2. Describe three types of plate boundaries and identify the land formations that result from these movementa.