Science Vocab
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, but 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 landform 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 range 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 contients.
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| Coal swamp | An oxygen poor environment where, over a period of time, decaying plant material changes into coal.
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| Supercontinent | An ancient landmass which separated into present-day continents.
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| Dinosaur | Dominant Mesozoic land vertebrates that walked with their legs position 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 which began 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 when a large portion of Earth's surface is covered by glaciers.
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| Glacial grooves | Grooves in solid rock formation made by rocks that are carried by glaciers.
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| Mega-mammal | Large mammal of the Cenozoic Era.
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| Geologist | A scientist who studies the Earth's
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| Paleontologist | A scientist that studies fossil remains found on the Earth's surface in order to study primitive life form such as : plants, animals, fungi, and bacteria.
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| Geologist assume the _____ rock layers are on top of the older ones, unless some type of disturbance occurs.This is called ______________________ | newest and Law of Superpostition
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| The strata of sedimentary rocks is important in determining their _____ age. | relative
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| Relative age determines the "relative" order of past events but not the ___________________ | absolute age
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| Strata is sometimes________. | disturbed
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| Preserved ______- or ________ of animals, plants, and other organisms from the remote past. | remains or traces
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| Fossil Record | History of life as documents by all fossils, preserved in sedimentary rock strata
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| Characteristics of Index Fossils | 1.Easy recognizable 2.Abundant 3.Wide geographic distribution 4. Live a short time.
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| M.Y stands for? | million years
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| Special fossils called "index fossils" indicate to geologist the ____________ in geological time. | boundaries
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| _________ rock layers contained only fossils of small, relatively simple life-forms. | Older
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| _________ rock layers contained fossils of simple life-forms, as well as fossils of more complex organisms. | Younger
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| Mass Extinction | Is the extinction of many species on Earth within a short period of time.
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| They hypothesize that the mass extinction of dinosaurs was called by a _________ impact. | Meteorite
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| Geographic isolation | Is the separation of a population of organisms from the rest of its species because of a physical barrier.
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