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MSCI 112 Final Exam Questions And Answers Latest Top Score.
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MSCI 112 Final Exam Questions And Answers Latest Top Score. An igneous rock was formed with 8000 radioactive (parent) atoms but contains only 1000 radioactive (parent) atoms today. If the half-life for the radioactive element is 10 million years, the rock is ___ million years old. - corr...

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  • September 25, 2024
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  • 2024/2025
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  • msci 112 final exam questions and answers latest

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MSCI 112 Final Exam Questions And
Answers Latest Top Score.


An igneous rock was formed with 8000 radioactive (parent) atoms but contains only
1000 radioactive (parent) atoms today. If the half-life for the radioactive element is 10
million years, the rock is ___ million years old. - correct answer. 30

Which of the common components of siliciclastic sediment are likely to have been
formed from the original sediment source rock through chemical weathering? - correct
answer. clays

Which is the largest division of geologic time? - correct answer. eons

Which process causes subsidence in a sedimentary basin? - correct answer. both
deposition of sediments and regional downfaulting

What is a nonconformity? - correct answer. a gap in the geologic record bounded
below by metamorphic or igneous rocks and bounded above by sedimentary rocks

The study of the history of ancient life based on the fossil record is called: - correct
answer. Paleontology

The remains of algae, bacteria, and other organic material may accumulate as organic
matter on the seafloor that can be transformed into: - correct answer. oil and gas

Why does mechanical weathering of an exposed rock cause chemical weathering to
take place more quickly? - correct answer. broken rock fragments have more exposed
surface area

Which of the following is a clastic sedimentary environment? - correct answer. alluvial

Which is the most common type of chemical or biological sedimentary environment? -
correct answer. carbonate environment

, The half-life of a radioactive material depends on: - correct answer. the half-life is
constant for any one material

The Precambrian represents about what fraction of the age of Earth? - correct answer.
90%

What is the geologic time scale? - correct answer. a division of Earth's history into
time intervals beginning and ending at times when fossils changed significantly

What is NOT an example of physical weathering? - correct answer. dissolution of
some minerals in a rock, causing it to weaken

Why does most of our information on geologic history come from continental rock? -
correct answer. oceanic crust older than 200,000,000 years has been recycled by
subduction

What type of event might lead to the development of an unconformity? - correct answer.
sea level drops

Cross-bedding forms on ___ of a sand dune - correct answer. the downwind side

How do most carbonate sediments and rocks in shallow environments form? - correct
answer. they are bioclastic materials

Coal is formed from: - correct answer. peat

What process must occur before an intrusive igneous rock can be weathered? - correct
answer. uplift

Which class of rock-forming minerals is the most common in Earth's crust? - correct
answer. silicates

The lead-zinc province of the Upper Mississippi Valley in the mid-western United States
is an example of a _________ deposit - correct answer. disseminated hydrothermal

The hardness of a mineral depends on the: - correct answer. strength of chemical
bonds

Minerals form by which of the following processes? - correct answer. both
crystallization and precipitation

Which of the following is a good estimate of the melting temperature of a typical crustal
rock? - correct answer. 700°C

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