Oceanography-Chapter 05

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____________ sediments were formed in the place they now occupy. ​

Authigenic​ hydrogenous

Biological sediments are the most abundant sediments in total volume in the ocean due to the high productivity of organisms along the continental shelf.​

False

Calcareous oozes are common at deep-ocean depths below 4,500 m.​

False

Manganese nodules can grow to exceed 1 meter in diameter within about 100 years.​

False

Manganese nodules have successfully been commercially mined in the ocean.​

False

The rate of sediment deposition is fairly consistent throughout the ocean.​

False

​Neritic sediments are mainly comprised of biogenous sediments due to the proximity to the continental shelf.

False

​The mix of rubble at the base of a rapidly eroding shore cliff is an example of a well-sorted sediment.

False

​The silica from the shells of diatoms dissolves at a faster rate than the calcium carbonate of foraminifera shells.

False

____________ is the process in which sediments are converted into sedimentary rock by compaction or by cementation.​

Lithification​

____________ is particles of organic or inorganic matter that accumulate in a loose, unconsolidated form.​

Sediment​

____________ is the study of layered sediment deposits.​

Stratigraphy

Clays can remain suspended in the water column for decades before settling due to their small size.​

True

Lithification is a pressure-induced process.​

True

Past sea surface temperatures can be determined from fossils found in deep ocean sediments.​

True

The compression of small biological particles into fecal pellets increases the rate at which they sink to the bottom of the ocean.​

True

​Neritic sediments are mostly eroded from land.

True

​Sediment on the continental slopes has an average thickness that is greater than sediment on the continental shelves.

True

​Sediments of white or cream color tend to be of biological origin.

True

A siliceous ooze is an example of a(n) ____________ sediment.​

biogenous​

The White Cliffs of Dover are composed of ____________.​

calcium carbonate chalk​ coccolithophore calcareous ooze

​Most marine sediments are composed of the finer particles of sand, silt, and ____________.

clay​

​The average thickness of sediment in the Atlantic Ocean is ____________ than the average thickness of sediment in the Pacific Ocean.

greater​ higher more

Diatom oozes are most common at ____________ latitudes.​

high​

Basalt and granite are examples of ____________ rocks.​

igneous​

The precipitation of calcium carbonate around shell fragments can form ____________ because they resemble fish eggs.​

ooliths​ oolites oolite sand

Deep-ocean sediment containing at least 30% biogenous material is called a(n) ____________.​

ooze​

The ____________ is an organism with a silicon-based shell.​

radiolarian diatom​

Oxidized sediments typically are ____________ in color.​

red​

​Which deposits are the result of gravity-propelled currents that produce graded layers of sediment deposits?

turbidites​

Sediments of the deep-ocean floor are typically ____________ sorted.​

well​

​Which statement is true of sediments in the ocean?

​Biogenous sediments comprise a larger area than terrigenous sediments.

​What occurs below the calcium carbonate compensation depth?

​Calcium carbonate begins to dissolve.

​Deep-ocean sediments are typically composed of ____.

​Fine clays

​Cosmogenous sediment

​Glassy nodule

​Authigenic sediment

​Manganese nodule

​Why is the average sediment thickness in the Pacific Ocean less than that of the Atlantic Ocean?

​Ocean trenches trap sediments.

​Which areas of the ocean is most likely to have the least accumulation of sediment?

​Oceanic ridge

​Biogenous sediment

​Ooze

​What is an example of authigenic sediment?

​Phosphorite deposits

​Coarse terrigenous sediment

​Quartz sand

​Mud-sized sediment

​Silt

​The west coast of South America is known for its seasonal upwelling. What kind of sediment is likely to be abundant in this area?

​biogenous

​What is the particle size distribution from largest to smallest?

​boulder → granule → coarse sand → coarse silt

​An abundance of foraminifera shells would be described as what type of sediment?

​calcareous ooze

​Which is an example of an evaporite?

​calcium carbonate

​Which particle size is transported the farthest by waves and currents?

​clay

​Which particle size has the fastest settling velocity in still water?

​coarse sand

​The White Cliffs of Dover in England were formed as a result of which marine organism?

​coccolithophore

​The ____ comprise the highest percent of ocean area, but contain the lowest percent sediment volume.

​deep-ocean floor

​What type of deep ocean sediment is most common in the deep-ocean basins surrounding Antarctic?

​diatom ooze

​A poorly-sorted sediment would most likely be found in a(n) _____.

​eroding shore cliff

​Sediments that are gray in color tend to be ____.

​high in silica

​Which is classified as cosmogenous sediment?

​microtektites

​Approximately how much of the world's estimated oil and gas reserves are deposited within the sediments of continental margins?

​one-third

​Deep-sea drilling helped to give rise to the science of _____.

​paleoceanography

​Sediments of the slope, rise, and deep ocean floor that originate in the ocean are called ____.

​pelagic sediments

​Which oceanographic sampling device played a large role in verifying the plate tectonic theory?

​piston corer

​An area that experiences a high rate of erosion, such as a near shore cliff, will have which type of sediments in the surrounding waters?

​poorly-sorted sediments

​What is the main source of terrigenous sediments to the ocean?

​rivers

​Most marine sediments are composed of what size of particles?

​sand, silt, and clay

​Which geological processes explains why the ocean floors are so young?

​subduction

​What is the most abundant marine sediment in total volume?

​terrigenous

​What is the primary origin of most neritic sediments?

​terrigenous

​What type of marine sediment is derived from igneous rock?

​terrigenous


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