fossils section one
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15 terms
Terms | Definitions |
|---|---|
 how are fossils made | living htings die and are buried by sediments. the sediment hardens into rock and preserves teh shape |
| sedimentary rock | type of rock that is made of hardened sediment |
| fossils founds in rocks include | molds, casts, petrifed fossils, carbon films, trace fossils others are tar, amber or ice |
| molds | hollow area in sediment the shape of organism |
| cast | solid copy of shape of organism |
| petrified fossils | fossils which minerals replace all or part of organism |
| carbon films | thin coat of carbon on the rock fossil happens mostly for plants and insects |
| trace fossils | fossil footprint is a trace fossil |
| preserved remains | tar is used to preserve some remains of organisms |
| tar | sticky oil that seeps from earth surface |
| amber | hardened resin or sap of evergreen trees insects would get stuck and preserved |
| ice | freezing preserved organisms |
| fossil record | provides evidence of history and life in past environments and how groups changed over time |
| evolution | gradual change in living things over a period of time |
| extinct | no longer exists |
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