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Flashcards in Geology and Oceanography Deck (10)
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1

Plate tectonics

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

2

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

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

3

Where does spreading occur?

Mid ocean ridges, ocean floor

4

5 major oceans

Pacific
Atlantic
Arctic
Indian
Antarctic

5

Characteristics of oceanic plates

Created at mid ocean ridges and subduction zones
Younger than land plates

6

What is the continental shelf?

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

7

What is the continental slope?

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

8

What is continental rise?

Sediment accumulation, turbidity currents, mud and sand

9

What is the Abyssal plain?

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

10

What causes waves?

Primarily wind
Sometimes natural disasters