Oldest fossils are found in __________layer, deepest, youngest fossils are found in _______layer, top, fossils are found in layers of ________, sedimentary rock, sedimentary rock forms in ___________, layers, _________give clues about the past, fossils, fossils can tell you ______________, what the environment was like in the past, footprints preserved in mud are called______, trace fossils, Whole insects can be trapped in_________, tree sap , the sap that hardens over time is called, amber.

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