Your mission today is to explore the layers of the earth online and to be able to define each layer throughout the earth. It is important to know these layers because we do live on earth. It helps us understand the origins of the earth and how some things like plate tectonics, volcanoes, oceans and the atmosphere came to be. Pretend that you are a geologist, a person who studies the earth. Your goal is to choose a layer of the earth and act like you are writing to a very important person who wants to know more about it.