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they dont have an origin, they are in (the whole earth is) what is called the rock cycle

its like the chicken and the egg question to suggest the origins of rocks. their structure changes based on what minerals are present and temperatures and pressures are present at the time of formation in either the earths crust or mantle. there are 3 groups of rocks: Igneous: come form magma in earths mantle/crust (volcanic rock) Sedimentary: laid down in beds/layers from deposition of ancient seas and rivers Metamorphic: rocks that are subjected to immense pressure and temperature of different levels of the earth (deeper -the higher the pressure and temp)

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