Combustible rock.
Minerals have different colors..
Dislocation of land.
Mountains have roots.
Rotating sphere.
Least dense stone on Earth.
Natural hole in the ground.
Tremors precede eruptions.
Delayed weaker quakes.
Rocks sink underground.
Cracks and fault lines.
Displacement of land.
Causes potholes.
400 km below surface.
Mountains move.
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