The oldest layers are on the bottom, and the newest layers are on top. Sedimentary rocks often contain many fossils, as sediments can contain once-living organisms.
Fossils are organisms that once lived and whose shapes and forms can still be identified. The presence of marine life in rocks indicates that the area where the rocks were deposited was once an ocean. Fossils of marine life are sometimes found in high mountains, suggesting that rocks formed on the seafloor were uplifted. Earth's plates have calmed down and stopped moving. Plate movement has resulted in the formation and breakup of continents over time. Plate movement is responsible for all geological changes that occur on Earth.
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