Oceanic Geological Features

Question 1

A guyot is:

Answer 1

An isolated underwater volcanic mountain with a flat top.

Question 2

Where would you be most likely to find oil

and natural gas reserves?

Answer 2

Passive Margins

Question 2

What is the approximate age of the oldest oceanic crust?

Answer 2

180 million years

Question 3

New seafloor is created at:

Answer 3

Mid-ocean ridge or Mid-oceanic ridge

Question 3

What is a distinguishing characteristic of the
seamounts of the Pacific Plate?

Answer 3

Conical Tops

Question 5

Lying generally between the foot of a continental rise and a mid-ocean ridge,_______ are the most level parts of the deep ocean floor, usually found at depths between 3000 and 6000 m.

Answer 5

Abyssal Plains

Question 5

What is the term for deep clefts descending from the
continental slope?

Answer 5

Submarine canyons

Question 6

Ocean trenches are formed at ______ boundaries.

Answer 6

Oceanic-Oceanic Convergent

and

Oceanic-Continental Convergent

Question 8

_____ _____, a coastal landform and a type of

dune system, are exceptionally flat or lumpy areas

of sand, that are parallel to the mainland coast.

Answer 8

Barrier Islands

Question 10

A gently sloping, shallow area of the ocean floor that extends outward from the edge of a continent is called a:

Answer 10

continental shelf

Question 11

The drving force that causes crustal plates

to move is created by:

Answer 11

Convection cells within the mantle

Question 11

What is a tombolo composed of?

Answer 11

Sand

Question 12

Where are you most likely to find a fresh water lens?

Answer 12

Beneath a sandy oceanic island

Question 13

What is the most abundant extrusive rock?

Answer 13

Basalt

Question 14

Abyssal plains are usually found at depths between 3000 and ____ meters.

Answer 14

6000

Question 15

The black sand beaches of Hawaii are

made of what type of rock?

Answer 15

Basalt

Question 16

Guyots are also known as _______.

Answer 16

Seamounts

Question 17

A _____ _____ is an underwater mountain range, formed by plate tectonics.

Answer 17

Mid-ocean ridge or Mid-oceanic ridge

Question 18

Mid-ocean ridges are created at ______ boundaries.

Answer 18

Divergent

Question 19

Abyssal plains cover more than __% of the Earth’s surface.

Answer 19

50

Question 20

The steep, seaward edge of the continental shelf is called the:

Answer 20

Continental slope

Question 22

A _____ _____ is the transition between oceanic and

continental lithosphere which is not an active

plate margin. It is constructed by sedimentation

above an ancient rift.

Answer 22

Passive margin

Question 23

An atoll is best defined as:

Answer 23

A ring-shaped reef, island, or chain

of islands formed of coral.

Question 24

Some ______ _______ are found as extensions to large rivers; however most of them have no such association.

Answer 24

Submarine Canyons

Question 25

The Puerto Rico Trench is the deepest part of the
Atlantic Ocean. How does this trench differ from the
deep trenches in the Pacific Ocean?

Answer 25

It is located at a transform plate boundary

Question 26

What is a tombolo?

Answer 26

A bar of sand joining an island to the mainland.

Question 27

A _______ ________ is a steep-sided valley cut

into the sea floor of the continental slope, sometimes

extending well onto the continental shelf.

Answer 27

Submarine canyon

Question 28

What is the Charles Darwin theory of atoll formation?

Answer 28

1. Formation of a fringing reef (on the side of a newly formed volcanic island)
2. Formation of a barrier reef (as the volcanic island sank)
3. Formation of an atoll