geologic time
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
Help!
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| eon | the longest unit of geologic time.
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| era | A large division of geologic time that is smaller than an eon.
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| period | A unit of geologic time smaller than an era.
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| epoch | A division of geologic time smaller than a period.
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| mass extinction | The extinction of many species on Earth within a short period of time.
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| land bridge | A land form that connects two continents that were previously separated.
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| geographic isolation | The separation of a population of organisms from the rest of its species due to some physical barrier such as a mountain rage or an ocean
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| Paleozoic era | The oldest era of the Phanerozoic eon.
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| Mesozoic era | The middle era of the Phanerozoic eon.
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| Cenozoic era | The youngest era of the Phanerozoic eon.
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| inland sea | A body of water formed when ocean water floods continents.
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| coal swamp | An oxygen-poor environment where, over a long period of time, decaying plant material changes into coal.
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| super continent | An ancient landmass that separated into present day continents.
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| dinosaur | Dominant Mesozoic land vertebrates that walked with their legs positioned directly below their hips.
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| plesiosaur | Mesozoic marine reptile with a small head, long neck, and flippers.
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| pterosaur | Mesozoic flying reptile with large, bat like wings.
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| Holocene epoch | The current epoch of geologic time that started 10,000 years ago.
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| Pleistocene epoch | The first epoch of the Quaternary period.
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| Ice age | A period of time where a large portion of earths surface is covered by glaciers.
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| Glacial groove | Grooves in solid rock formations made by rocks that are carried by glaciers.
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| Mega mammal | A large mammal of the Cenozoic era.
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Created by:
Tiffani.omalley
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