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unit 7
| Term | Definition |
|---|---|
| uniformitarnism | A principle that geologic processes that occurred in the past can be explained by current geologic processes |
| fossil | the trace or remains of an organism that lived long ago most commonly preserved in sedimentary rock |
| trace fossil | a fossilized structure such as a footprint or coprolite that formed in sedimentary rock by animal activity on or within soft sediment |
| climate | the weather conditions an area over a long period of time |
| ice care | a long cylinder of ice obtained from drilling through ice caps or ice sheets used to study past climates |
| relative dating | Any method of determining weather an event or object is older or younger than other events or objects |
| superpostion | a principle that younger rocks lie above older rocks if the layers have not been disturbed |
| uncoinfermity | a break in the geologic record created when rock layers are record or when sediment is not deposited for a long period of time |
| geologic column | An ordered arrangement of rock layers that is based on the relative ages of the rocks and in which the oldest rocks are at the bottom |
| absolute dating | any method of measuring the age of an event or object in years |
| radio decay | the process in which a radioactive isotope tends to break down into a stable isotope of the same element or another element |
| half life | the time required for half of a sample of radioactive decay to form a daughter isotope |
| radiometric dating | a method of determining the absolute age of an object by comparing the relative percentages of a radioactive parent isotpe and a stable daughter |
Created by:
McKenna Melit ;)