Geology Cafe

Oceanography 101

Quiz Questions - Chapter 5 - Ocean Basins


Questions 1 to 6 refer to the image below that shows a map of the coastline and the seafloor in a region including Monterey Bay (between the coastal cities of Monterey and Santa Cruz) and Monterey Canyon (shown as MC). On the image, the arrow for letter E points to the coastline along Monterey Bay.

Map of bathymetry of Monterey Bay region

1. On the seafloor, Letter A is located on:
a) continental rise
b) continental shelf
c) continental slope
d) an abyssal plane

2. On the seafloor, Letter B is located on:
a) continental rise
b) continental shelf
c) continental slope
d) an abyssal plane

3. On the seafloor, Letter C is located on:
a) continental rise
b) continental shelf
c) continental slope
d) an abyssal plane

4. An an extensive flat section of the seafloor, Letter D is located on:
a) continental rise
b) continental shelf
c) continental slope
d) an abyssal plane

5. The “shelf break” is located:
a) between letters A and B.
b) between letters B and C.
c) between letters C and D.
d) at letter E

6) Monterey Canyon (shown as letters “MC”) is about twice the size of the Grand Canyon in Arizona. Submarine landslides and turbidity currents move sediments down submarine canyons to be deposited mostly on the:
a) continental rise
b) continental shelf
c) continental slope
d) an abyssal plane

7) An example of a passive margin is:
a) the coast of California
b) the coast of southern Alaska
c) the East Coast of the United States
d) Hawaii

8) Trenches are:
a) long, relatively narrow canyon-like features that run parallel to continental margins.
b) the deepest parts of ocean basins.
c) usually occur in the ocean along volcanic island chains.
d) all of the above.

9) An ancient submarine volcano that has a flat top (beveled by wave action before sinking into ocean depths) and may lack fringing reefs is called :
a) an atoll.
b) a seamount.
c) a guyot.
d) a mid-ocean ridge.

10. The shallowest and youngest parts of deep ocean basins are:
a) mid-ocean ridges
b) abyssal plains
c) volcanic island arcs
d) trenches

11) As new ocean crust forms along mid-ocean ridges, what happens to the older ocean crust?
a) older crust moves away from spreading centers.
b) the older ocean crust cools and sinks deeper into the ocean basins.
c) the ocean crust is blanketed with layers of ocean sediments.
d) all of the above.

12) Pillow basalts occur where:
a) sediments accumulate in beds on the seafloor.
b) lava erupts and cools quickly on the seafloor on submarine volcanoes along mid-ocean ridges.
c) lava erupts from a volcano on an island arc chain.
d) fringing reefs form around an ancient volcano.

13) Serpentinite is the State Rock of California. It occurs in abundance throughout the coast ranges of Northern California. Serpentinite is a rock formed from:
a) the accumulation of the remains of ancient sea snakes.
b) a rock formed by the metamorphic alteration of ocean crustal rocks (basalt and gabbro) by exposure to seawater seeping into the ocean crust over time.
c) a rock formed from the accumulation of undersea landslide deposits.
d) all of the above.

14) As old ocean crust is destroyed in subduction zones, new continental crust forms as a result of:
a) water and gases released by increasing heat and pressure helps to melt some of the old ocean crust.
b) low temperature "felsic" minerals melt first and migrate upward, forming volcanoes and new continental crust.
c) high temperature "mafic" minerals are consentrated in the old ocean crust that sinks back into the mantle.
d) all of the above.

15) Black smokers and white smokers are features are:
a) hydrothermal vents associated with volcanic activity on the seafloor.
b) most common along the rift zones associated with mid-ocean ridges.
c) host to biological communities that are supported by chemotrphophic bacteria.
d) all of the above.

16. About 35 million years ago was the last time that Antarctica was ice free. Since then sea level has fallen and risen many times as continental glaciers advanced and retreated. During the peak of the high seas, the continental shelves extended inland, covering the coastal plains around the world. In North America, the hypothetical boundary between the Atlantic and Gulf coastal plains and upland regions is called:
a) fall line.
b) shelf break.
c) Piedmont.
d) continental rise.

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1/1/2016