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OCE CH 4
depth at which all carbonate is in solution
associated with glacial deposits
depth at which carbonate begins to dissolve
associated with deep sea fans
particle size classification
Texture refers to the size and shape of sediment particles.
Sediments derived from weathered rock and volcanic activity are called biogenous sediments
Beach sand is usually well-sorted
A glacial deposit is well-sorted
A well-sorted sand deposit with rounded particles might be called immature
The Wentworth scale is used to arrange the amount of sorting in a sediment deposit
Calcareous shells will not accumulate on the ocean floor when the water depth exceeds about 4500 meters
(around 15,000 feet).
The deposition of radiolarian oozes is affected by the carbonate compensation depth
Radiolarian oozes form near the equator
Phosphate nodules are found on the continental shelf.
Organisms that live on the ocean floor may be responsible for keeping manganese nodules from being buried in
The major force bringing continental sediments to the open ocean is (are):
Sediments which are poorly sorted and made of a variety of minerals could have been deposited by:
Which of the following contains calcium carbonate (CaCO3)?
Which of the following contains silica (SiO2)?
Sediments derived form preexisting rocks are called:
Sediments produced by plants and animals in the sea called:
Sediments produced as a result of chemical reactions in seawater are called:
Sediments with an extraterrestrial origin are called:
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:
All of the following are hydrogenous sediments
c. manganese nodule.
The element found in some sediments which suggest that a meteorite or asteroid impact occurred nearby is:
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
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:
increase seawater salinity
increase seawater salinity