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.,

Fossils

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