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Because it has a boundary called "MOHOROVICIC DISCONTINUITY" or "MOHO" for short. It separates the crust to the mantle. The crust looks like floating because of it.

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Yo gela ouo. hahaha simply because the mantle or the mesosphere and asthenosphere is more dense than the crust or lithosphere and the mantle or the mesosphere and asthenosphere is less dense compared to the inner core. charr
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