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Earth's History

QuestionAnswer
The preserved remains or traces of an organism that lived in the past Fossil
a rock that forms from compressed or cemented layers of sediment Sedimentary Rock
A scientist who studies fossils Paleontologist
Change over time Evolution
No longer in existence Extinct
The age of a rock compared to the ages of rock layers Relative Age
The age of a rock given as the number of years since the rock formed. Absolute Age
The top rock layer and its fossils is the youngest and the bottom is the oldest. Law of Superposition
An igneous rock layer formed when lava flows onto Earth's surface and hardens. Extrusion
An igneous rock layer formed when magma hardens beneath Earth's surface. Intrusion
A break in the geologic record created when rock layers are eroded or when sediment is not deposited for a long period of time. Unconformity
a fossil known to have lived in a particular geologic age that can be used to date the rock layer in which it is found Index Fossil
A break in the earth's crust Fault
A type of fossil formed when a shell or other hard part of an organism dissolves, leaving an empty space in the shape of the part. Mold
a solid copy of the shape of an organism Cast
a fossil in which minerals replace all or part of an organism Petrified Fossil
A type of fossil that provides evidence of the activities of ancient organisms Trace Fossil
a type of fossil consisting of an extremely thin coating of carbon on rock Carbon Film Fossil
the study of Earth's surface and history Geology
Created by: brugnoc
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