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Chapter 9
Geologic Time Vocab
Question | Answer |
---|---|
Describe the geologic time scale. | a time table that outlines the development of Earth |
Define a geologic column. | an ordered vertical arrangement of rock layers based on their relative ages |
Describe an ERA | a unit of geologic time that includes two or more periods |
Describe a PERIOD | units of geologic time that combine to form an era |
Describe a EPOCH | units of geologic time that combine to form a period |
What is a geologic period usually named for? | the place where characteristic fossils were first discovered |
What is the KT boundary? | The boundary that accounts for the extinction of the dinosaurs |
What element was found at the KT boundary and used as evidence of an asteroid impact? | Iridium |