OCE CH 4
A glacial deposit is well-sorted
False
Wentworth Scale
particle size classification
Which of the following contains silica (SiO2)?
radiolarians
In general, polar neritic sediment has more:
rock and gravel than in tropical waters
Sediments produced by plants and animals in the sea called:
terriginous
A well-sorted sand deposit with rounded particles might be called immature
False
The major force bringing continental sediments to the open ocean is (are):
Wind
ice rafting
associated with glacial deposits
diatomaceous ooze
biogenous sediment
foraminiferans
biogenous sediment
silaceous ooze
biogenous sediment
stromatolites
biogenous sediment
Sediments with an extraterrestrial origin are called:
cosmogenous
tektites
cosmogenous sediment
CCD
depth at which all carbonate is in solution
lysocline
depth at which carbonate begins to dissolve
A very important way to increase the settling rate of fine particles in the open ocean is via:
fecal pellets
Which of the following contains calcium carbonate (CaCO3)?
foraminiferans
Sediments produced as a result of chemical reactions in seawater are called:
hydrogenous
halite
hydrogenous sediment
manganese nodules
hydrogenous sediment
metal sulfides
hydrogenous sediment
oolites
hydrogenous sediment
Manganese nodules are an example of a:
hydrogenous sediments.
evaporation
increase seawater salinity
high temperature
increase seawater salinity
In contrast to manganese nodules which form on the abyssal plain, phosphate-rich nodules form in:
intermediate to shallow depth water
The element found in some sediments which suggest that a meteorite or asteroid impact occurred nearby is:
iridium
A pelagic clay contains lots of material that settle to the seafloor through the water column and are:
less than 30% biogenous material.
Sediments derived form preexisting rocks are called:
lithogenous
Sediments found on continental margins are called
neritic
Sediments derived from weathered rock and volcanic activity are called biogenous sediments
False
The Wentworth scale is used to arrange the amount of sorting in a sediment deposit
False
The deposition of radiolarian oozes is affected by the carbonate compensation depth
False
Beach sand is usually well-sorted
True
Calcareous shells will not accumulate on the ocean floor when the water depth exceeds about 4500 meters (around 15,000 feet).
True
Organisms that live on the ocean floor may be responsible for keeping manganese nodules from being buried in the sediment.
True
Phosphate nodules are found on the continental shelf.
True
Radiolarian oozes form near the equator
True
Texture refers to the size and shape of sediment particles.
True
Sediments which are poorly sorted and made of a variety of minerals could have been deposited by:
a glacier
All of the following are lithogenous sediments
a. beach sand. c. glacial deposits. d. illite clays. e. volcanogenic particles.
All of the following are hydrogenous sediments
a. evaporites. b. halites. c. manganese nodule. d. phosphates.
The most likely place to find abundant manganese nodules is on the
abyssal plain far from a continent
turbidite
associated with deep sea fans
