7. plate tectonics 8. A deep depression under the ocean floor is a trench . The name of the supercontinent is called Pangaea . Mid-ocean ridges are underwater mountain chains.
Earth s interior layer, composed of both solid and putty-like rock is called the mantle .
The area where one plate is pulled beneath the other is called a subduction zone . The thinnest layer of Earth is called the crust . The innermost layer of Earth is called the core . Label the diagram below. Fossils indicate that tropical plants once lived on what is now Antarctica.