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fossils
poop
20
Science
7th Grade
11/09/2011

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Term
fossils!!!
Definition
the preserved remains or traces of living things!!!
Term
mold!!!
Definition
a hollow area in sediment in the shape of an organism or shape of an organism!!!
Term
cast!!!
Definition
a solid copy of the shape of an organism!!!
Term
carbon film!!!
Definition
an extremely thin coating of carbon on a rock!!!
Term
trace fossils!!!
Definition
provide evidence of the activities of ancient organisms!!!
Term
fossil records!!!
Definition
provides evidence about the history of life and past environments on Earth!they also show how different groups of organisms have changed over time!!!
Term
evolution!!!
Definition
the change in living things over time!!!
Term
relative age!!!
Definition
the rocks age compared to ages of other rocks!!!
Term
absolute age!!!
Definition
the number of years that have passed since the rock has formed!!!
Term
extrusion!!!
Definition
lava that hardens on the surface and hardens igneous rock!!!
Term
intrusion!!!
Definition
when magma cools and hardens into a mass of igneous rock formed below earths surface!!!
Term
index fossils!!!
Definition
fossils that are widely distributed and represented an organism that existed for a geologically short period of time!they are useful because they tell the relative ages of the rock layers in which they occur!!!
Term
unconformity!!!
Definition
when gaps in the geoloogical record and folding change the position in which rock layers appear!!!
Term
extinct!!!
Definition
when the entire species is no longer living!!!
Term
half life!!!
Definition
the time it takes for half of the radioactive atoms to decay!!!
Term
radioactive decay!!!
Definition
the process in which elements break down over time and the elements release particles and energy!!!
Term
carbon-14!!!
Definition
radioactive form of carbon!!!
Term
potassium-40!!!
Definition
the radioactive form of potassium!!!
Term
uniformitarianism!!!
Definition
the principle that states that the geologic processes that operate today also operated in the past!!!
Term
Precambrian time!!!
Definition
covers 88% of earth's history, ended 542 million years ago!!!
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