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A substance can't be rigid and molten. I wonder if you are confused by the lower mantle, also called the asthenosphere, which is not molten but can flow. In any case the layers are:

  1. The crust, which is solid rock and therefore rigid, though of course sufficient force will deform or fracture it.
  2. The mantle, which is essentially solid though the lower parts can flow much like asphalt under extreme pressure.
  3. The outer core, which is liquid iron and nickel.
  4. The inner core, which is solid iron and nickel.
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7y ago
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Q: Which layer of the Earth is rigid but molten?
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