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Many things can form a rock. Solidification of magma, compaction of sediment, and recrystalisation (metamorphosis) resulting from heat and pressure are main ones.

Rock cycle here: http://www.teachnet-lab.org/ps101/bglasgold/rocksEFCycleP2.gif

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Forms in metamorphic rock?

A metamorphic rock forms by heat and pressure


When melted rock cools or hardens on it under earths surface it forms rock?

Igneous rock. Extrusive igneous rock forms at or near the surface, intrusive igneous rock forms below the surface.


When melted rock cools or hardens on or under earth's surface it forms what rock?

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What rock forms under pressure?

metamorphic rock


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What type of rock forms at the boundary of magma and rock?

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