Unit 3 Lesson 1,2,3 Word Scramble
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Term | Definition |
Uniformitarianism | a principle states that geologic processes that occurred in the past can be explained by current geologic processes |
climate | the weather conditions in an area over a long period of time |
fossil | are the trace or remains of an organism that lived long ago, most commonly preserved in sedimentary rock |
ice core | a long cylinder of ice obtained from drilling through ice caps or ice sheets; used to study past climates |
trace fossil | a fossilized structure that formed in sedimentary rock by animal activity on or in soft sediment |
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 |
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 |
unconformity | a break in the geologic record created when rock layers are eroded or when sediment is not despoited for a long period of time |
absolute dating | any method of measuring the age of an event or object in years |
radiometric dating | a method of determining the absolute age of an object by comparing the relative percentages of a radioactive parent isotope and a stable daughter isotope |
radioactive 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 a radioactive isotope to break down by radioactive decay to form a daughter isotope |
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