Continental crust: The part of the Earth's crust that makes the continents. It is between 25 and 100km thick
oceanic crust: The part of the Earth's crust that is under the oceans. It is heavier than the continental crust and is made of basalt. It is between 5km and 10 km thick.
crust: The outer most layer of the Earth
mantle: That part of the Earth's structure between the crust and the core
inner core: Inner most layer of the Earth's structure, composed of nickel and iron. It is a solid layer due to intense pressure.
outer core: This layer of the Earth is liquid and is composed of iron.
subduction zone: This occurs at a destructive plate margin where oceanic crust, moving towards continental crust, is forced downwards into the mantle and destroyed.
destructive plate boundary: where two tectonic plates are moving together and oceanic crust is destroyed by subduction.
convection currents: circulating movements within the mantle generated by heating from the core
ocean trench:
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