GLY1102 Topic 1

question

Radiometric age dating, the basis of the establishment of the absolute geologic time scale, was not possible until after the discovery of radioactivity in the 20th century.
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False
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Disturbed rocks or strata are _____ those rocks that disturb them or cut through them.
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Older than
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A horizon between rocks or sediments with distinctly different ages is called a _____.
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Hiatus
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______ refers to the number of protons of an atom.
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Atomic number
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______ is the sum of protons and neutrons in the nucleus of an atom.
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Atomic mass
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Particles that settle under the influence of gravity settle to more nearly vertical layers.
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False
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This type of unconformity separates horizontal sedimentary rocks above and below the unconformity.
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Disconformity
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An isotope is a species of the same element with the same mass and different atomic number.
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False
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Radioactive decay is the spontaneous nuclear disintegration of isotopes at ______ rates.
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Constant
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The ______ is a product of placing rocks in their proper sequence of formation to create a composite record of geologic events.
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Relative geologic time scale
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The principle which states that \”in layered rocks (or strata) the oldest rocks are at the bottom and the younger layers are on top\” is the principle of ______.
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Superposition
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The basic rock unit defined on the basis of distinctive and easily recognized characteristics is a ______.
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Formation
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The principle which states that \”strata extend in all directions until they thin against edges of the basins they accumulated in\” is the principle of _____.
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Original lateral continuity
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Which of the following is the oldest?
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Lower Cretaceous
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Radiometric age dating techniques were used to establish the relative geologic time scale.
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False
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Based upon physical characteristic alone (not fossil characteristics), which type of hiatus would be most difficult to identify?
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Disconformity
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The original continuity of strata in a basin can be broken. A river can carve a canyon into a basin leaving once continuous layers stranded on opposite sides of the canyon. According to the principle of lateral continuity, these opposite sides of the valley were once laterally continuous.
answer

True

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