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Short "hint"

n. - Molten rock in the earth's crust.

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Usage examples (38)
  • There were countless miles of lava tunnels there, left by retreating magma from a time when the Moon was a burning young rock.
  • They form when molten rock called magma up and breaks through a weak area
  • Pockets of hot molten rock called magma collect beneath the surface of the Earth.
  • Instead, it will collect into huge underground reservoirs known as magma chambers.
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