Exam 7: Pages of Earths Past: Sedimentary Rocks

Which of the following is NOT true? As compared to arkose,quartz sandstone ________.

Grains become rounded primarily during ________.

Chemical and biochemical rocks are classified primarily on the basis of ________.

Two major sources of energy,coal and oil shale,are considered ________ sedimentary rocks.

Swamps,channels,floodplains,and submarine slopes all play a role in the development of ________.

A well-sorted sandstone with asymmetric ripples was most likely deposited as sand by a ________.

Geologists call individual layers of sedimentary rocks ________,whereas several of them together are called ________.

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)?

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

What type of sediment is typically found in lake bottoms?

Siltstone or mudstone containing marine fossils likely formed in a ________ environment.

Which transport medium carries the largest particles?

If water is the transport mechanism of sediment,the grain size of sedimentary deposits most closely indicates the ________.

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

The breakdown of exposed rock into small fragments and dissolved ions is termed ________.

Which environment would most likely produce sedimentary deposits characterized by very well-sorted,very well-rounded grains that are nearly pure quartz?

Symmetric ripples form when ________.

Because the velocity of sediment settling (deposition)is positively related to grain size for waterborne sediments,fluvial deposits are more likely than glacial deposits to ________.

Glacial till is composed of ________-sized particles.

Lithified detritus (breakdown products of preexisting rocks)forms which kind of sedimentary rock?