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Unit 7 lesson 1 + 2
Term | Definition |
---|---|
Uniformitarianism | 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, mist commonly preserved in sedimentary rock |
Trace fossil | A fossilized structure, such as footprints or a coprolite, that formed in sedimentary rock by animal activity on or within soft sediment |
Climate | The weather conditions in an area over a long period of time |
Ice core | A long cylinder od ive obtained from drilling through ice caps or ice; used to study past climate |
Relative dating | Any method of determining whether an event or object is older or younger than other events or objects |
Superposition | A principle that states that younger rocks lie above older rocks if the layers have not been disturbed |
Unconformity | A break in the geologic record created when rock layer are eroded or when sediment is not deposited for a long period of time |
Geologic column | An ordered arrangement of rocks layers that is based on the relative ages of the rocks and in which the oldest rocks are at the bottom |