"the continual changing of one kind of rock into another kind", "rock cycle" "hot, melted rock beneath Earth's surface", "magma" "magma that reaches Earth's surface", "lava" "a rock formed from hot, melted rock that cools and hardens", "igneous rock" "a rock formed from another rock that has been squeezed and heated (within the Earth)", "metamorphic rock" "a rock formed from tiny pieces of broken (weathered) rocks pressed together", "sedimentary rock" "tiny broken bits of rocks, plants, bones, and shells", "sediment" "the remains of a once living thing from long ago", "fossil" "a rock that contains a useful mineral", "ore" "one of the parts that a rock is made of", "mineral" "the way something shines in the light", "luster" "the color of the powder made when a mineral is scratched on white tile", "streak" "the ability of a mineral to scratch another mineral", "hardness"
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