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Earth has layers because after it was formed, the decay of radioactive elements, combined with heat released by colliding particles produced some melting of its interior. This allowed the _____ elements, mostly _____ and ______, to since to Earth;'s center because of _____. The _____ dense rocky components floated _______, toward the surface. This sinking and floating is believed to still be occurring, but on a much smaller scale. As a result of this process, Earth's ______ _______ is not made up of _______ materials; it ________ of distinct _______ with ______ properties.
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