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29 Cards in this Set
- Front
- Back
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The process occurring in the upper atmosphere by which water molecules are split by high-energy beams of ultraviolet light from the sun is termed
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photo-chemical dissociation
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The process by which water vapor and other gases were released from rocks within the first
billion years of Earth’s history |
outgassing
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basement complex of metamorphism and igneous rocks that lay beneath fossil-bearing sedimentary strata.
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Preambrian
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The most extensive exposures of Precambrian rocks are in geologically stable regions of continents called...
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Shields
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Relatively thin blankets of sedimentary strata that cover regions of stable, basement rocks is called a...
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platform
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The Canadian shield is divided into several provinces of the basis of...
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structural trends and age dats
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What is the order, from oldest to youngest, of the Precambrian...
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Hadean, Archean, and Proterozoic Eons
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The uppermost units of a greenstone sequence consist mostly of...
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marine sedimentary rock
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Granulites are...
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igneous rocks formed entirely of plagioclase feldspar
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The idea that the solar system originated as a result of distilling from a rotating cloud of dust particles is called the...
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nebular hypothesis
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The ultramafic rocks that reflect the higher temperature gradients that prevailed during the Hadean are called...
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Komatiites
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One possible environment in which life may have evolved on Earth...
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black smoker
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What two processes accounted for adding free oxygen to the atmosphere?
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Photosynthesis and photodissociation
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What are the two Eons in Precambrian?
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Archean and Pretorozoic
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What are the two requirements for the origin of life?
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1) A source of the appropriate elements for organic molecules
2)Energy sources to promote chemical reactions |
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What was produced in Miller's experiment and what were the Gas elements and energy sources used?
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Amino Acids
methane, ammonia, hydrogen, and water |
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When did the Archean end?
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The Archean ended 2.5 billion years ago.
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What is the general vertical sequences of rock types?
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(From Base)
Ultramafic Mafic Felsic Sedimentary |
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When did the Proterozoic Eon start and end?
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2.5 billion years ago and ended 544 million years ago
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What are the 3 subdivisions of the Proterozoic era?
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Proterozoic, Mesoproterozoic, neoproterozoic
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What is orogeny?
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A mountain building event?
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What are the four Paleozoic orogenic belts around North American craton?
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Codilleran, Franklinian, Caledonian-Arcadian,Appalachian
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What Orogenic belt is in the west side of North American craton is called...?
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Codilleran
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What Orogenic belt is the east side of North Americancraton is called...?
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Appalachian
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What is a cyclothem?
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Inter-bedded marine and non marine sequence
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Below Pennsylvanian coal bed: Marine or Non-marine sequence?
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Non-Marine
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Above Pennsylvanian coal bed: Marine or Non-Marine sequence?
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Marine
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What is the possible explanation for the widespread cyclothems?
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The rise and falling of sea level relate to advances and retreats of Gondwanan continental glaciers.
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