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45 terms

OCE CH 4

STUDY
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diatomaceous ooze
biogenous sediment
foraminiferans
biogenous sediment
halite
hydrogenous sediment
manganese nodules
hydrogenous sediment
metal sulfides
hydrogenous sediment
oolites
hydrogenous sediment
silaceous ooze
biogenous sediment
stromatolites
biogenous 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.
True
Sediments derived from weathered rock and volcanic activity are called biogenous sediments
False
Beach sand is usually well-sorted
True
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 arrange the amount of sorting in a sediment deposit
False
Calcareous shells will not accumulate on the ocean floor when the water depth exceeds about 4500 meters
(around 15,000 feet).
True
The deposition of radiolarian oozes is affected by the carbonate compensation depth
False
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.
True
The major force bringing continental sediments to the open ocean is (are):
Wind
Sediments which are poorly sorted and made of a variety of minerals could have been deposited by:
a glacier
Which of the following contains calcium carbonate (CaCO3)?
foraminiferans
Which of the following contains silica (SiO2)?
radiolarians
Sediments derived form preexisting rocks are called:
lithogenous
Sediments produced by plants and animals in the sea called:
terriginous
Sediments produced as a result of chemical reactions in seawater are called:
hydrogenous
Sediments with an extraterrestrial origin are called:
cosmogenous
All of the following are lithogenous sediments
a. beach sand.
c. glacial deposits.
d. illite clays.
e. volcanogenic particles.
Manganese nodules are an example of a:
hydrogenous sediments.
All of the following are hydrogenous sediments
a. evaporites.
b. halites.
c. manganese nodule.
d. phosphates.
The element found in some sediments which suggest that a meteorite or asteroid impact occurred nearby is:
iridium
The most likely place to find abundant manganese nodules is on the
abyssal plain far from a continent
In contrast to manganese nodules which form on the abyssal plain, phosphate-rich nodules form in:
intermediate to shallow depth water
Sediments found on continental margins are called
neritic
In general, polar neritic sediment has more:
rock and gravel than in tropical waters
A pelagic clay contains lots of material that settle to the seafloor through the water column and are:
less than 30% biogenous material.
A very important way to increase the settling rate of fine particles in the open ocean is via:
fecal pellets
evaporation
increase seawater salinity
high temperature
increase seawater salinity