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A cycle is something that is on repeat. It can repeat for however long it has the necessary components. This washing machine is an example because it has a cycle that needs soap, clothes, and water, without one of those the cycle can't be completed.

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An igneous rock is a rock that has formed from cooled lava.

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A metamorphic rock is a rock made up of other rocks pressed into each other.

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A sedimentary rock is a rock that has layered sediments from other rocks that were broken off by erosion.

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The rock cycle is how all three types of rock are connected to each other. Any rock can become any other two rocks.

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As I explained at the very top of this, a cycle needs everything to work properly. You can't make an igneous rock without heat, and a sedimentary rock without sediment.

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Fossils are very important because they provide a glimpse into the earth's past. Without fossils, we would not have the slightest idea of what caused our planet to form, take shape, and produce life.