Crust - Outermost layer of the earth. It is made of solid rock, Mantle - Thickest layer of the earth divided into upper and lower sections, Outer core - This is in a liquid state and is mainly made up of iron, Inner core - This is solid due to the pressure of the overlying layers and is made up of nickel and iron, Lithosphere - The part of the Earth's internal structure that is made of solid rock, Asthenosphere - The part of the Earth's internal structure that is in a molten state, Moho line - The boundary between the earth's crust and mantle, Plates - Large rigid sections of the earth's crust that move due to convection currents, Plate tectonics - The movement of plates, Continental drift - Wegner's theory of how all the continents were once joined together, then broke up and drifted apart, Sea-floor spreading - Hess's theory of how new rock is created on the sea floor where the plates split apart, Plate boundaries - The edges of plates, Divergent plates - Pull apart and construct new land, Convergent - Push together and land is destroyed, Transform - Slide past each other and land is neither created or destroyed, Fissure - Crack in the Earth's crust, MYA - Million years ago, Subduction - When the heavier plate is brought beneath the lighter plate and is melted in the mantle, Endogenic Forces - Forces within the earth's crust which cause the eaerth's surface to move, Pangaea - The 'supercontinent' which existed approx 250 mya,

Chapter 1: Plate Tectonics

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