Download Ch 2 test

Chapter
[KB1]
The Ocean Floor
2
Multiple Choice
1.
Which one of the following is NOT part of the continental margin?
a. continental shelf
b. continental slope
c. continental rise
d. continental trench
2. It is thought that submarine canyons on the continental slope have been generated by
__________.
a. streams when sea level was much lower than it is today
b. streams when sea level was much higher than it is today
c. a submarine glaciation
d. turbidity currents
3. Which of the following is NOT true of deep ocean trenches?
a. They are long and narrow depressions.
b. They are sites where plates plunge back into the mantle.
c. They are geologically very stable.
d. They may act as sediment traps.
4. The study of ocean floor contours is called __________.
a. biology
b. topography
c. psychology
d. bathymetry
5. Seamounts ____________.
a. are a special type of oceanic trench
b. are volcanoes that form on the ocean floor, where the top has been worn away
c. form only in the Pacific Ocean basin
d. are submarine canyons found near Australia
6. Which of the following is NOT one of the large ocean basins?
a. Pacific
b. Atlantic
c. Mediterranean
d. Arctic
7.
Which of the following is associated with ocean ridges?
a. rift zones
b. mountainous topography
c. volcanic structures
d. all of these
8. The gently sloping submerged surface extending from the shoreline toward the deep ocean is
termed the ____________.
a. continental shelf
b. continental slope
c. continental rise
d. submarine canyon
9.
The crests of mid-oceanic ridges __________.
a. are heavily mantled with sediment
b. lie at depths exceeding 6 kilometers
c. contain active rift zones
d. are geologically old features
10. ____________ develop where oceanic lithosphere bends downward and sinks into the
mantle.
a. Submarine canyons
b. Abyssal seamounts
c. Deep ocean trenches
d. Rift valleys on mid-ocean ridges
11. An echo sounder operates by measuring the time required for a ____________.
a. light beam to travel from a satellite at a known altitude to the sea bottom and back
b. radar beam to travel from a harbor patrol boat to a fuzz-buster on a speeding yacht
c. radar beam to travel from a ship to the seafloor and back
d. sound pulse travels from a ship to the seafloor and back
12.
The oceans cover approximately __________ percent of Earth's surface.
a. 40
b. 50
c. 60
d. 70
13.
The _______ Ocean is largest.
a. Atlantic
b. Pacific
14.
15.
c. Indian
Which ocean has the greatest average depth?
a. Atlantic
b. Pacific
c. Indian
d. Arctic
d. Arctic
Concerning the distribution of land and water, which of the following statements is true?
a. The percentage of land and water is about the same in both the Northern and Southern
Hemispheres.
b. The Southern Hemisphere has much more water surface than the Northern
Hemisphere.
c. The Northern Hemisphere has much more water surface than the Southern
Hemisphere.
d. None of the above is true.
16. The continental rise is located ____________.
a. at the top of a mid-ocean ridge
b. at the top of the continental slope
c. between an abyssal plain and continental slope
d. at the seaward edge of a deep ocean trench
17. Which one of the following concerning mid-ocean ridges is false?
a. They are sites for submarine eruptions of basaltic lava.
b. They are where young lithosphere is added to the edges of spreading, oceanic plates.
c. They have thick coatings of old sediment.
d. Sediments include thick siliceous ooze deposits.
18. The __________ Ocean has more extensive abyssal plains than the Pacific Ocean because it
has fewer trenches to trap sediments moving down the continental slope.
a. Indian
b. Atlantic
c. Arctic
d. none of these
Word Analysis:
Examine the words and/or phrases for each question below and determine the relationship
among the majority of words/phrases. Choose the option which does not fit the pattern.
19. a. sodium chloride b. magnesium chloride c. sodium sulfate d. carbon dioxide
20. a. echo sounder
b. Doppler radar
c. side scan sonar
d. radar altimeters
d. continental volcanic arc
21. a. continental shelf
b. continental rise
c. continental slope
22. a. rift valley
b. subduction
c. volcanic island arc
d. trench
True – False
______23.
The west coast of South America and the east coast of North America have very
different continental margins.
______ 24.
Abyssal plains with sediments covering the seafloor igneous rocks are more
extensive in the central Pacific basin than in the North Atlantic.
______25.
Submerged, flat-topped seamounts are known as guyots.
______26.
Oceanic crust is made of granite and continental crust is made of Baslt.
______27.
Submarine canyons form the deepest parts of the ocean basins.
______28.
Compared to the Southern Hemisphere, a higher percentage of the Northern
Hemisphere is water covered.
______29.
The continental rise lies at the bottom of the continental slope.
______30.
Seafloor hot springs occur mainly in oceanic, abyssal plains.
Visualization Questions
31.
Label the different features of the passive continental margin on the diagram below.
32.
What type of continental margin is illustrated in the diagram below? Explain what is
occurring in this diagram.