Maars often fill with water and form lakes. For example, olivine, augite, and hypersthene are mafic rocks. This magma erupts through volcanoes. Sharks may use the magnetic field of the Earth for navigation purposes on migrations. The mantle is the layer of the Earth located between the crust and the molten core.
Mass extinction is the process in which huge numbers of species die out suddenly.
It is divided into the Triassic, Jurassic, and Cretaceous periods. Dinosaurs, mammals, and flowering plants evolved during the Mesozoic, and Pangaea broke up. The era ended with the K-T mass extinction. A meteor is a meteoroid that has entered the Earth's atmosphere, usually making a fiery trail as it falls. It is sometimes called a shooting star.