Geology and Oceanography

Question 1

Plate tectonics

Answer 1

Make up upper crust of Earth and float on upper mantle. Move 8-10 cm per yr.

Question 2

Plate movements
A) convergent
B) divergent
C) subduction
D) strike slip

Answer 2

A) move together
B) move apart
C) move under. Causes volcanoes, trenches, mountains
D) move opposite directions

Question 3

Where does spreading occur?

Answer 3

Mid ocean ridges, ocean floor

Question 4

5 major oceans

Answer 4

Pacific
Atlantic
Arctic
Indian
Antarctic

Question 5

Characteristics of oceanic plates

Answer 5

Created at mid ocean ridges and subduction zones

Younger than land plates

Question 6

What is the continental shelf?

Answer 6

Up to 200 M, created by erosion, continental crust. Biologically rich.

Question 7

What is the continental slope?

Answer 7

3,000-4,000 M, steep, boundary between continental and oceanic crust. Submarine canyons.

Question 8

What is continental rise?

Answer 8

Sediment accumulation, turbidity currents, mud and sand

Question 9

What is the Abyssal plain?

Answer 9

4,500-6,000 M. Oceanic crust below, mostly flat soft sediment. Manganese nodules and other resources undiscovered in plain.

Question 10

What causes waves?

Answer 10

Primarily wind

Sometimes natural disasters