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Because if they are preserved right like in amber or ice, they will be unchanged and untouched for millions of years which will give us a window in to the dinosaur age or ice age. Fossils are formed by sediment. Fossils also document changes in genetic structure in living things.

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Different things happen to different rocks so that they change into an entirely new form of rock. For example, if any of the rocks get broken down they can reform and become sedimentary rocks. If you take any of the rocks and you heat them up until they become magma, when the cool they will become Igneous rocks. If you take any of the rocks and you add heat and pressure they will form a metamorphic rock.

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It is when any of the three rocks from the rock cycle change into a different form. Ex - Igneous to Sedimentary to Metamorphic and then back to Igneous.

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A series of events that are regularly repeated in the same order.

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Wind and Rock break rocks down into tiny pieces. Those pieces could collect in a river bed or sand dunes, over time these tiny rocks collect more and more and press down on each other forming sedimentary rocks. Ex - Sandstone

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A rock that forms by heat and friction in earths shifting crust. Metamorphic rock turns into Igneous rock.

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When Magma moves up to the earths surface and begins to cool. The have different properties based on where they cooled on the earth's surface or the earth's crust.