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An interval of time during which a characteristic, often regularly repeated event or sequence of events occurs.

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A igneous rock is one of the three types of rock. This type of rock is formed  through the cooling and hardening of magma or lava.

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Metamorphic Rock is the second type of rock out of the three types of rock. This rock was one form of rock but has changed to another under the influence of heat and pressure.

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The final type of rock is Sedimentary Rock. Sedimentary rocks are formed when sediment is deposited out of air, ice, wind, gravity, or water flows carrying the particles.

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An idealized cycle of processes undergone by rocks in the earth's crust, involving igneous intrusion, uplift, erosion, transportation, deposition as sedimentary rock, metamorphism, remelting, and further igneous intrusion.

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The Rock Cycle is a group of changes. Igneous rock can change into sedimentary rock or into metamorphic rock. Sedimentary rock can change into metamorphic rock or into igneous rock. Metamorphic rock can change into igneous or sedimentary rock.

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Fossils are important because they  represent the remains of once-living organisms. Another reason is, the kinds of fossils found in rocks of different ages differ because life on Earth has changed through time.