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Geologic Time

Mrs. Matkins and Mrs. Vogt

Key vocabulary review from our geologic time and plate tectonics work.

Continental Drift The second largest division of time.
Catastrophism In plate tectonics, the boundary between two plates that are diverging, or moving away from each other.
Superposition A principle that states that geologic processes that occured in the past can be explained by current geologic processes.
Cast The standard method used to divide the Earth's long natural history into manageable parts.
Tectonic Plate The name Alfred Wegener gave to the large landmass, made up of all continents, that he believed existed before it broke apart to form the present continents.
Geolgic Column The largest division of time.
Eon A type of fossil that forms when sediments fill in the cavity left by a decomposed organism.
Era Any method of determining whether an event or object is older or younger than other events or objects.
Absolute Dating The theory that the Earth's lithosphere is divided into tectonic plates that move around on top of the asthenosphere.
Fossil In plate tectonics, the boundary between two plates that are converging, or moving toward each other.
Pangaea In plate tectonics, a section of Earth's lithosphere (crust and upper mantle) that moves around on the mantle.
Mold A principle that states that younger rocks lie above older rocks if the layers have not been disturbed.
Divergent Boundary In plate tectonics, a boundary between two plates that are sliding horizontally past one another.
Convergent Boundary An arrangement of rock layers in which the oldest rocks are at the bottom.
Relative Dating The theory that continents can drift apart from one another and have done
Transform Boundary Any method of measuring the age of an event or object in years.
Uniformitarianism The trace or remains of an organism that lived long ago, most commonly preserved in sedimentary rock.
Geologic Time Scale A principle that states that geologic change occurs suddenly.
Plate Tectonics A mark or cavity made in a sedimentary surface by a shell or other body.

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