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한국어
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While driving through mountains with his parents, Kaya was stunned by the beauty and enormity of the mountains. He noticed the side of a mountain had many layers with varying thickness and shades of color. Kaya’s dad told him that millions of years ago, ____ was deposited over and over again for many centuries in that area, resulting in the different colors seen in the ____. Kaya then realized the amount of sediment ____ was not always the same. Each layer varied in its thickness. The mountains Kaya admired so much took ____ of years to display such magnificence.

Fossil Fuels

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