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Exam 6: Pages of Earths Past: Sedimentary Rocks

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Question 31

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The removal of detritus from weathered rock at an outcrop is termed ____________.

A) deposition
B) erosion
C) weathering

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Question 32

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Clastic sedimentary rocks are primarily classified on the basis of ____________.

A) grain size
B) degree of sorting
C) angularity
D) mineral composition

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Question 33

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Compaction and cementation of grains occurs during ____________.

Diagenesis requires ____________.

Which transport medium carries the largest particles?

Physical precipitation of gypsum due to evaporation of seawater produces which kind of sedimentary rock?

When limestone becomes chemically altered so that half of the calcium atoms are replaced by magnesium,the resultant rock is termed ____________.

What type of sediment is found in lake bottoms?

It is unusual for ____________ to carry grains larger than sand.

Ripples,dunes,and cross bedding are sedimentary structures that can be used to help determine _____________.

What causes the formation of an alluvial fan?

Pulling a block of clay apart,resulting in the middle portion thinning and sinking,is an adequate analogy for ___________.

What do hot springs,the immense salt layers beneath the Mediterranean Sea,and Native American tools and weapons have in common?

A fine-grained clastic rock that splits into thin sheets is ____________.

Which environment would most likely produce sedimentary deposits characterized by poorly to moderately sorted,angular to subangular grains that consist of feldspar,quartz,and lithics (rock fragments) ?

Chemical weathering takes place most rapidly in environments that are ____________ and ____________.

Sea level rises locally,and marine sediments are deposited on top of terrestrial sediments during events termed ____________.

If evidence of cross bedding was discovered on a barren planet such as Mars,what could you assume was once occurring on the planet?

Death Valley,part of the Basin and Range Province,has been sinking partially due to the weight of continuously accumulating sediment shed from the Black and Panamit Mountains that border the valley.What phenomenon is this an example of,and what depositional environment is created by the sediment deposition?

Waves cause beach sand to be ____________.