A Trip through Geologic Time
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| fossil | the preserved remains or traces of an organism
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| petrified fossil | a fossil formed when minerals replace all or part of an organism
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| carbon film | plant leaves may form this fossil by leaving a thin layer of carbon on rock
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| trace fossils | a type of fossil that can provide clues about the activities of ancient organisms
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| paleontologist | scientist who studies fossils
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| extinct | a type of organism that no longer exists on Earth
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| relative age of a rock | its age compared to the ages of other rocks
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| Law of Superposition | in horizontal layers of sedimentary rock, each layer is older than the layer above it and younger than the layer below it
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| unconformity | a gap in the geologic record where some rock layers have been lost because of erosion
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| index fossils | the fossils of organisms that were widely distributed but only lived during a short period of time
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| radioactive decay | occurs when atoms of an unstable element break down to form atoms of another element
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| half-life | the time it takes for half of the radioactive atoms in a sample of a radioactive element to decay
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| geologic time scale | a record of the life forms and geologic evewnts in Earth's history
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| vertebrates | animals with backbones
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| Pangaea | a supercontinent formed about 260 million years ago
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| fossil in amber | a type of fossil where you might find the remains of an insect preserved with little or no change
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| evolution | the process by which all the different kinds of living things have changed over long periods of time
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| absolute age of rocks | can be determined by radioactive dating
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| eras | the divisions of the geologic time scale of Paleozoic, Mesozoic, and Cenozoic
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| Cenozoic Era | Age of Mammals includes present day
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| Mesozoic Era | Age of Reptiles includes the dinosaurs
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| mammals | warm-blooded vertebrates
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| Quarternary Period | a series of ice ages occurred when Earth's climate cooled
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| carbon-14 | a radioactive element used by geologists to determine the age of organic remains
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| age of Earth | 4.6 billion years old
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| igneous rocks | rocks that radioactive dating works best with
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| amphibian | an animal that lives part of its life on land and part of its life in water
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| Precambrian Time | began with Earth forming from a mass of dust and gas
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| fossils form | when living things die adn their remains are buried by sediments
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You may also shuffle the rows of the table by clicking on the "Shuffle" button.
Or sort by any of the columns using the down arrow next to any column heading.
If you know all the data on any row, you can temporarily remove it by tapping the trash can to the right of the row.
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Created by:
Mrs. Gordon
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