a rigid block of crust and upper mantle rock.
the outer layer of the Earth.
the layer of the planet Earth beneath the crust and outside of the core.
the center-most part of Earth.
an opening in Earth's crust through which molten lava, ash and gases are ejected.
molten rock beneath the Earth's surface (*found inside a volcano).
molten rock that issues from a volcano (*liquid that flows on the outside of a volcano).
when the plates of Earth's crust move to form landforms such as mountains and trenches.
the idea that the Earth originally consisted of one large super-continent (one piece of land).