Earth

• The earth is made up of several different layers. The

  outer layer is known as the crust and is made of solid

  rock. The crust ranges from 5 to 70 km in depth and is

  split into a number of pieces known as plates. Some

  plates have land on top of them - this is known as

  continental crust. Others have oceans on top and are

  known as oceanic crust. The point where plates meet

  is called a plate boundary.
• What term describes the warming of the Earths surface and the air above or caused by trapped gases -greenhouse effect