fossil, the hardened remains of plants or animals that died long ago. A clue about life in the distant past., trace fossil, A clue to the activity of an animal that lived long ago. Tells us how animals might have moved., mold, An imprint made by the outside of a dead animal or plant, cast, When minerals fill a mold they form this. It has the same outside shape as the living thing., igneous rock, This rock forms when melted rock inside of the Earth cools and hardens.  , sedimentary rocks, This type of rock develops from sediment. This is the type of rock where most fossils are found., metamorphic rock, rocks that have changed from heat or pressure., faults, cracks in the Earth's upper layer., erosion, the stripping away of land or soil., minerals, the solid materials that make up rock., paleontologists, Scientists who study fossils..

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