To help you master concepts from Chapter 3 (The Sea Floor), take this sample examination. Bon Voyage!

1		Most ocean water probably came from: Need a Hint?
			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 shelf? Need a Hint?
			A)	It slopes very gently seaward.
			B)	It has variable width.
			C)	It is a shallow submarine platform at the edge of continents.
			D)	all of these
3		The average slope angle of the continental shelf is: Need a Hint?
			A)	0.01 degree.
			B)	1 degree.
			C)	10 degrees.
			D)	0.1 degree.
4		The average slope of the continental slope is: Need a Hint?
			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 are called: Need a Hint?
			A)	mud flows.
			B)	debris flows.
			C)	turbidity currents.
			D)	none of these
6		Oceanic trenches: Need a Hint?
			A)	parallel the edges of continents and island arcs.
			B)	are typically 8-10 km deep.
			C)	are narrow deep troughs.
			D)	all of these
7		Which is characteristic of mid-ocean ridges? Need a Hint?
			A)	high heat flow
			B)	basalt eruptions
			C)	shallow focus earthquakes
			D)	all of these
8		Reefs parallel to the shore but separated by a broad lagoon are called: Need a Hint?
			A)	patch reefs.
			B)	atolls.
			C)	barrier reefs.
			D)	fringing reefs
9		Pelagic sediment could be composed of: Need a Hint?
			A)	volcanic ash.
			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: Need a Hint?
			A)	abyssal plain.
			B)	continental rise.
			C)	continental slope.
			D)	continental shelf.
11		Fragments of ocean floor that escape subduction are known as: Need a Hint?
			A)	guyots.
			B)	granulites.
			C)	migmatites.
			D)	ophiolites.
12		The continental rise is: Need a Hint?
			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: Need a Hint?
			A)	Subduction zones.
			B)	Passive continental margins.
			C)	Atolls.
			D)	Active continental magins.
14		Abyssal plains are formed by: Need a Hint?
			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: Need a Hint?
			A)	continental slopes.
			B)	abyssal plains.
			C)	mid-ocean ridges.
			D)	ocean trenches.
16		Active volcanoes are associated with: Need a Hint?
			A)	Ocean islands.
			B)	Mid-Ocean Ridges.
			C)	Active continental margins.
			D)	all of these
17		Guyots are: Need a Hint?
			A)	coral reefs.
			B)	stratovolcanoes.
			C)	extinct volcanoes.
			D)	active volcanoes.
18		Oceanic fracture zones are associated with: Need a Hint?
			A)	manganese nodules.
			B)	fringing reefs.
			C)	convergent plate boundaries.
			D)	transform faults.
19		Terrigenous sediment in the ocean: Need a Hint?
			A)	is precipitated from seawater.
			B)	is derived from volcanic eruptions.
			C)	is composed of shells of microscopic organisms.
			D)	is derived from erosion of the continents.
20		The oldest seafloor on Earth is not more than: Need a Hint?
			A)	2 million years old.
			B)	20 million years old.
			C)	2 billion years old.
			D)	200 million years old.