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Science Vocab Ch. 7
Geologic Time; Lessons 1 - 4
Term | Definition |
---|---|
Eons | ... are the longest units of geologic time. |
Eras | Eons are subdivided into smaller units of time called ... |
Periods | Eras are subdivided into ... |
Epochs | Periods are subdivided into ... |
Mass Extinction | A ... is the extinction of many species on Earth within a short period of time. |
Land Bridge | A ... connects two continents that were previously separated. |
Geographic Isolation | ... is the separation of a population of organisms from the rest of its species due to some physical barrier, such as a mountain range or an ocean. |
Paleozoic Era | The ... is the oldest era of the Phanerozoic eon. |
Mesozoic Era | The ... is the middle era of the Phanerozoic eon. |
Cenozoic Era | The ... is the youngest era of the Phanerozoic eon. |
Inland Sea | An ... is a body of water formed when ocean water floods continents. |
Coal Swamp | A ... is an oxygen-poor environment where, over time, plant material changes into coal. |
Supercontinent | A ... is an ancient landmass which separated into present-day continents. |
Dinosaur | ... were dominant Mesozoic land vertebrates that walked with legs positioned directly below their hips. |
Plesiosaur | ... were Mesozoic marine reptiles with small heads, long necks, and flippers. |
Pterosaur | ... were Mesozoic flying reptiles with large, batlike wings. |
Holocene Epoch | The most recent epoch, the ..., began 10,000 years ago. |
Pleistocene Epoch | The ... was the first epoch of the Quaternary period. |
Ice Age | An ... is a time when a large proportion of Earth's surface is covered by glaciers. |
Glacial Groove | ... are grooves made by rocks carried in glaciers. |
Mega-Mammal | The large mammals of the Cenozoic era are called ... |