Thursday, December 27, 2012

Study Guide-Fossils

Fossil- are the preserved clay or traces of living things most(prenominal) Fossils form when living things die and are buried by sediments. The sediments slowly harden into shake up and preserve the shapes of the existences. Fossils are ordinarily found in sedimentary rock. Sedimentary rock is the fictitious character of rock that is made of hardened sediment Fossils found in rock include molds and casts, petrified dodos, one C films, and trace fossils. Other fossils form when the remains of organisms are preserved in substances such as tar, amber, or ice. Mold hollow area in sediment in the shape of an organism or part of an organism Cast- solid imitate of the shape of an organism Petrified Fossils- are fossils in which minerals replace all or part of an organism Carbon film- An extremely thin coating of carbon on rock Trace fossils- provide evidence of the activities of ancient organisms The fossil record provides evidence about the history of life and past environments on Earth. It as well shows that different groups or organisms have changed all over time.
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Paleontologist- scientists who studies fossils Scientific Theory- well-tested concept that explains a wide range of observations Evolution- bit-by-bit change in living things over long periods of time ------------------------------------------------- Extinct- an organism that no longer exists and will never live on Earth Relative Age- age compared to the age of other rocks Absolute Age- is the numerate of years since the rock formed To determine relative age geologists also extrusions and intrusions of igneous rock, faults, and chaps in the geologic record. Extrusion- Lava that hardens on the surface Intrusion - Magna cools and hardens into a mass of igneous rock. Fault-break in the Earths crust Unconformity- gap in the geologic record Index Fossil- a fossil that helps geologists retard rock layers Index Fossils are useful because they tell the relative ages of rock layers in which they occur... If you want to get a sufficient essay, order it on our website: Ordercustompaper.com

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