atmosphere - the layer of gases that surrounds the earth, hydrosphere - the water part of the earths surface, lithosphere - the rigid outer shell of he earth, crust - 40 km thick ,and a solid rock, mantle - 2 900 km thick , melted rocks, core - 3 500 km thick, inner core - solid iron and nickel, outer core - liquid iron and nickel, plate tectonics - a theory stating that the continents where connected then moved apart, evidence - proof that something happened,

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