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Fossils Tell of Long Ago 2nd grade power point By Ai Chinen Amber • A yellowish sap from plants that hardens and becomes a fossil. Fossil • A plant, animal, or imprint that has turned to stone. Extin ct…. • Not alive today; all members of the group or species have died out. Peat • Swampy forest soil Mammoth • A kind of elephant that lived millions of years ago.