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Ch 23 Ocean Floor Review Flashcards | StudBud
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Ch 23 Ocean Floor Review
Ch 23 Ocean Floor Review
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#oceanography #oceanfloor
Flashcards
32 cards
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Questions
32
Answers
1
What are fracture zones and where are they most often found?
midocean ridges interact with transform fault
midocean ridges come above water
2
Where do deep sea trenches occur?
where one plate subducts under another
at midocean ridges
where two plates smush together
3
How do satellites obtain information about the sea floor?
sonar
cloud reflectivity
echo sounding
ocean surface height
4
What are calcareous oozes?
60% silicone dioxide
30% CaCO3 (calcium carbonate)
5
Which biogenous sediment is most common?
turtle power
siliceous oozes
calcareous oozes
6
Why do scientists study the remains of marine organisms in seafloor sediments?
to study extraterrestrials
to study earth's climate and bio history
7
What is believed to have formed the large submarine canyons?
density currents
turbidity currents
gulf stream currents
salinity currents
8
What is the steepest part of the continental margin?
floor
slope
rise
shelf
9
When ocean plates subduct under continental plates what feature is common along the continent?
deepsea canyons
volcanic mountains
guyouts
midocean ridges
10
What is the calcite compensation depth (CCD)?
depth above which calcium will disolve
depth below which calcium will grow
depth below which calcium will disolve
11
What is the difference between passive and active continental margins?
active is near subduction zone; passive is not near faults
active is not near faults; passive is near subduction zone
12
How do icebergs add sediments to the ocean?
icebergs bump against the shore
glaciers scrape land and calve into ocean
13
Where are abyssal hills most often found?
near island arcs
near subduction zones
near midocean ridges
14
What are biogenous sediments?
chemical reactions on the sea floor
come from continental minerals and rocks
come from living organisms
15
Which size particles will be deposited closest to the shoreline when a river enters the sea?
largest
medium
smallest
small
16
What does sonar measure?
ocean temperature
ocean life
ocean heat
ocean depth
17
What are turbidity currents?
underwater volcanoes
density currents
underwater landslides
18
Ocean floor sediments are classified according to what?
origin
color
size
mineral
19
What is occurring at a mid-ocean ridge?
2 plates moving apart (diverging)
2 plates moving together
1 plate subducting under another
20
When ocean plates subduct under oceanic plates, what features are common along the boundary?
continental slope
abyssal plain
continental shelf
island arcs
21
What are hydrogenous sediments?
come from chemical reactions on the seafloor
come from dead whales
come from terrestrial runoff
22
What is another name for biogenous sediments?
calcareous fluff
green gunk
siliceous scum
marine snow
23
How is an atoll formed?
coral reef grows on seamount
earthquakes cause tsunamis
midocean ridges spread
24
Which type of sediment are manganese nodules?
hydrogenous
terregenous
biogenous
hypoteneuse
25
What is the shallowest part of the continental margin?
rise
slope
floor
shelf
26
What is a guyot and how is it formed?
cone shaped seamount
flat eroded seamount
midocean ridge mountain
27
What are terrigenous sediments?
chemical reactions on the seafloor
decayed bio matter
continental rock and minerals
28
Where are most siliceous oozes found?
antarctica and equator
north america
arctic and Indian oceans
29
What features are found at active margins and missing at passive margins?
earthquakes, volcanoes, deepsea trench
continental shelf, continental rise
30
How does sonar work?
bounces light signal to ocean floor and measures time return
bounces sound signal to ocean floor and measures time return
drops a weighted line to ocean floor and measures the length
31
What is a seamount?
continental shelf
midocean ridge mountains
cone shaped volcanic islands
Iceland
32
A method of obtaining a sample of sea floor sediment with its layers preserved uses a
sonar
satellite
magnetometer
corer
