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43 terms

Oceanography Ch.4 Test 1

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coccolithophores, diatomaceous ooze, foraminiferans, siliceous ooze, stromatolites
biogenous sediment
halite, manganese nodules, metal sulfides, oolites
hydrogenous sediment
tektites
cosmogenous sediment
CCD
depth at which all carbonate is in solution
ice rafting
associated with glacial deposits
lysocline
depth at which carbonate begins to dissolve
turbidite
associated with deep sea fans
Wentworth Scale
particle size classification
Texture refers to the size and shape of sediment particles.
Texture refers to the size and shape of sediment particles.
False
Sediments derived from weathered rock and volcanic activity are called biogenous sediments.
True
Beach sand is usually well sorted.
False
A glacial deposit is well sorted.
False
A well sorted sand deposit with rounded particles might be called immature.
False
The Wentworth scale is used to determine the amount of sorting in a sediment deposit.
True
Calcareous shells will not accumulate on the ocean floor when the water depth exceeds about 4500 meters (around 15,000 feet).
False
The deposition of radiolarian oozes is affected by the carbonate compensation depth.
True
Radiolarian oozes form near the equator.
True
Phosphate nodules are found on the continental shelf.
True
Organisms that live on the ocean floor may be responsible for keeping manganese nodules from being buried in the sediment.
wind
The major force bringing continental sediments to the open ocean far from land is:
large particles such as gravel
High energy environments are most likely to contain which one of the following?
a glacier.
Sediments that are poorly sorted and made of a variety of minerals could have been deposited by:
foraminiferans
Which of the following contains calcium carbonate (CaCO3)?
radiolarians
Which of the following contains silica (SiO2)?
lithogenous
Sediments derived from preexisting rocks are called:
biogenous
Sediments produced by organisms in the sea called:
hydrogenous
Sediments produced as a result of chemical reactions in seawater are called:
cosmogenous.
Sediments with an extraterrestrial origin are called:
diatom ooze.
All the following are lithogenous sediments except:
1 & 5
Sediments that are derived primarily from the weathering of continental material are indicated by the number(s):
2, 3, & 4
Biogenous sediments are indicated by the number(s)
4
Calcareous oozes are represented by the number(s);
2 & 3
The sediments that are produced in areas of high primary productivity are indicated by the number(s):
hydrogenous sediment
Manganese nodules are an example of a:
stromatolites
All the following are hydrogenous sediments except:
iridium.
The element found in some sediments that suggests that a meteorite or asteroid impact occurred nearby is:
abyssal plain far from a continent.
The most likely place to find abundant manganese nodules is on the:
intermediate to shallow depth water.
In contrast to manganese nodules, which form on the abyssal plain, phosphate-rich nodules form in:
neritic
Sediments found on continental margins are called:
rock and gravel than in tropical waters.
In general, polar neritic sediment has more:
less than 30% biogenous material
A pelagic clay contains material that settles to the seafloor through the water column and is:
fecal pellets
An important way to increase the settling rate of fine biogenous particles in the open ocean is via:
calcareous, oolites, diatoms,
tektites, coarse lithogenous sediment
Word Analysis. Examine the five words and/or phrases and determine the relationship among the majority of words/phrases. Choose the one option that does not fit the pattern.