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Multiple Choice Quiz
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1
Most ocean water probably came from:
A)comets impacting Earth's surface.
B)rain falling into the ocean basins.
C)volcanic degassing of the planet.
D)melting of polar ice caps.
2
Which is true of the continental slope?
A)It marks the edge of the continental crust.
B)It has a variable width.
C)It descends to great depths.
D)all of these
3
The average slope of the continental shelf is:
A)0.01 degree.
B)1 degree.
C)10 degrees.
D)0.1 degree.
4
The average angle of slope for the continental slope is:
A)more than 30 degrees.
B)10-12 degrees.
C)4-5 degrees.
D)1-2 degrees.
5
Great masses of sediment-laden water that are pulled by gravity into submarine canyons are called:
A)mud flows.
B)debris flows.
C)turbidity currents.
D)none of these
6
Oceanic trenches:
A)are found along all continental margins.
B)are typically 8-10 km deep.
C)were eroded by rivers during the Ice Ages when sea-level was lower.
D)all of these
7
Which property is characteristic of mid-ocean ridges?
A)high heat flow
B)basalt eruptions
C)shallow focus earthquakes
D)all of these
8
Reefs parallel to the shore but separated from it by a wide, deep lagoon are called:
A)patch reefs.
B)atolls.
C)barrier reefs.
D)fringing reefs
9
Pelagic sediment could be composed of:
A)calcareous ooze.
B)siliceous ooze
C)red clay.
D)all of these
10
The portion of the continental margin that marks the true edge of the continent is the:
A)abyssal plain.
B)continental rise.
C)continental slope.
D)continental shelf.
11
Fragments of ocean floor that escape subduction are known as:
A)guyots.
B)granulites.
C)migmatites.
D)ophiolites.
12
The continental rise is:
A)a flat-topped seamount.
B)a portion of the mid-ocean ridge.
C)an uplifted portion of the continent.
D)a wedge of sediment at the base of the continental slope.
13
Geologically quiet coasts are termed:
A)Subduction zones.
B)Passive continental margins.
C)Atolls.
D)Active continental margins.
14
Abyssal plains are formed by:
A)slow accumulation of pelagic sediment.
B)deposition of sediment from rivers.
C)deposition from turbidity currents over time.
D)none of these
15
The deepest portions of the ocean basins are:
A)continental slopes.
B)abyssal plains.
C)mid-ocean ridges.
D)ocean trenches.
16
Active volcanoes are associated with:
A)Ocean islands.
B)Mid-oceanic ridges.
C)Active continental margins.
D)all of these
17
Guyots are:
A)coral reefs.
B)stratovolcanoes.
C)extinct volcanoes.
D)active volcanoes.
18
Oceanic fracture zones are associated with:
A)manganese nodules.
B)fringing reefs.
C)convergent plate boundaries.
D)transform faults.
19
The continental shelves of the world are typically covered by relatively young sediments derived from:
A)precipitation from seawater.
B)from volcanic eruptions.
C)shells of microscopic organisms.
D)the erosion of the continents.
20
The oldest seafloor on Earth is not more than:
A)million years old.
B)20 million years old.
C)billion years old.
D)200 million years old.





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