Answer:
Igneous: Cooling of Magma
Metamorphic: Heat and Pressure
Sedimentary: Sediments being pushed together (pressure) after they have made their way together.
Step-by-step explanation:
Igneous rocks are formed from melted rock deep inside the Earth. Sedimentary rocks are formed from layers of sand, silt, dead plants, and animal skeletons. Metamorphic rocks formed from other rocks that are changed by heat and pressure underground.
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