asthenosphere - the upper part of the earth's mantle, core - the innermost compositional layer of earth, consisting primarily of iron and nickel, crust - the outermost, solid layer of the planet, isotope - atoms of the same element that differ in the number of neutrons in the nucleus, mantle - that part of earth´s interior beneath the crust and above the core, meteorite - a meteor that hits the surface of the earth, seismic waves - waves produced as a result of an earthquake,

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