MSCI 112 Final Exam Questions And Answers Latest Top Score.
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Course
MSCI 112
Institution
MSCI 112
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...
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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