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Question
What is one possible explanation for the crustal subsidence that created extensive areas of downwarping such as in Michigan and Illinois?A) Cessation of compression along a convergent plate boundary
B) Cessation of upwelling from a mantle plume
C) Cessation of subduction, with detachment of the descending slab, creates a downward pull in the mantle
D) The crust is extended to maintain a convergent plate boundary where the descending plate is sinking
Answer
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Related questions
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A) Missing time.
B) Faults, fractures are younger than the rocks they cut through.
C) Sedimentary layers/lava
D) The oldest is on the bottom, the youngest on top.
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F) Chunks of weathered rock are older than the rock they are contained in.
1. Superposition
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5. Unconformities
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A detrital sedimentary rock can be radiometrically dated because the clasts formed at the same time as the rock.
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In what era is the Jurassic period?
A) Precambrian
B) Paleozoic
C) Mesozoic
D) Cenozoic
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What does "-zoic" in the eras of the geologic time scale refer to?
A) Life
B) Water
C) Rock
D) Fossilization
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Which era are we currently in?
A) Mesozoic
B) Precambrian
C) Paleozoic
D) Cenozoic
Q:
What is the effective maximum range for carbon-14 dating?
A) 100,000 years
B) 70,000 years
C) 10,000 years
D) 13,000 years
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What is the half-life of potassium-40?
A) 1.3 billion years
B) 704 million years
C) 14.1 billion years
D) 4.5 billion years
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You are an archaeologist researching artifacts left behind by Francisco Pizzaro's conquest of Peru in the 1530s. In order to confirm the authenticity of the leather artifacts, you are performing radiometric dating using an isotope pair that has a half-life of 250 years. In order for the artifacts to date back to the time of Pizzaro's conquest, approximately how much original radioactive isotope must be left in the artifacts?
A) 50%
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A) 25
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B) An atom that has more or fewer electrons than it should
C) An atom that has double the protons of a stable atom
D) A nucleus of an atom that has split during the decay process
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B) Matching up rocks of similar age in different regions
C) Putting events in order from first to last
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________ is the scientific study of fossils.
A) Quaternary geology
B) Volcanology
C) Geomorphology
D) Paleontology
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A) basaltic
B) granitic
C) shale
D) obsidian
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Which of the following is a metamorphic facies?
A) Kaolinite
B) Staurolite
C) Eclogite
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________ is a widespread type of metamorphism typically associated with mountain building.
A) Pyrometamorphism
B) Burial metamorphism
C) Shock metamorphism
D) Regional metamorphism
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Generally speaking, how does the chemical composition of most metamorphic rocks compare to that of the parent rock?
A) Their chemical composition will be nearly the same.
B) In order to be a metamorphic rock, the chemical composition must change by 50 percent.
C) There will be a complete compositional change.
D) Knowing the chemical composition is not necessary to understand metamorphic rocks.
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Which of the following rocks represents the highest grade of metamorphism?
A) Biotite schist
B) Quartzite
C) Phyllite
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Which of the following is the parent rock of quartzite?
A) Limestone
B) Conglomerate
C) Granite
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A) 0 km
B) 30 km
C) 25 km
D) 13 km
Q:
What kind of metamorphism will occur if the environmental conditions are 400C and 5 kilobars?
A) Hydrothermal
B) Contact
C) Regional
D) Subduction zone