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Earth History 6+7
| Question | Answer |
|---|---|
| extends from Earth's origin to the beginning of human history | geological time |
| based on the kinds of living organisms that existed during four very large chunks of time | era |
| eras are divided into these smaller times that are based on evidence of major events that took place in Earth's crust | periods |
| era between the beginning of Earth and the appearance of the first complex forms of life | Precambrian era |
| the age of ancient life, which ended with the Great Extinction, during which 90% of the species living in the ocean disappeared | Paleozoic era |
| the middle age of life, the time of the dinosaurs | Mesozoic era |
| the age of recent life, during which mammals thrived | Cenozoic era |
| a gap in the rock record; an interruption in the normal sequence of deposition of sedimentary rocks or between sedimentary rocks and other kinds of rocks | unconformity |
| any evidence of past life | fossils |
| Fossils which lived for a relatively short period of time and in many locations that are used to provide information about the age of rock layers | index fossils |
Created by:
cbryner1
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