molten rock - hot, liquified rock; magma underground that turns to lava as it reaches Earth’s surface, igneous rock  - formed by the cooling and hardening of molten rock, sedimentary rock - formed by sediment that is pressed and layered over time, metamorphic rock - formed when there is a change in heat or pressure, rock cycle - a process by which rocks can be changed into different kinds of rocks, rock - a naturally occurring solid made up of one or more minerals,

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