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Flashcards in Ocean Water and Sea Basins Deck (38)
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1

Oceans cover __ percent of the Earth's surface

70

2

The ____ of ocean water is still under scientific debate

origin

3

The land on the globe is concentrated in the ______ hemisphere

northern

4

The Southern Hemisphere is primarily...

oceans with very little land

5

which hemisphere contains all of our major continents?

northern

6

Does the uneven distribution of land affect large scale ocean water circulation?

Yes

7

the uneven _____ of land affects large scale ocean water ______

distribution, circulation

8

What are the four main, main,interconnected ocean basins comprising the world ocean?

Pacific, Indian, Atlantic, and Southern

9

when all of the continents were joined in the supercontinent Pangea, ocean currents were..

very simple

10

As the continents split apart, ocean currents became more...

complex

11

Where is the deepest part of the ocean? How deep is it?

- Marianas Trench
- 11km at its deepest. 4.5 km average

12

The overall topography of the ocean floor: there is a continental _____ that is part of the crust that _____ downward to the ocean _____.

shelves, slopes, floor

13

What is the ocean floor also called?

the abyssal plain

14

Oceanic crust, on average, is ______ then continental crust

younger

15

How old is the oldest oceanic crust?

200 million years

16

Oceanic crust is younger because it is rapidly _____ through ______ at subduction zones and ______ at mid ocean ridges

renewed, destruction, formation

17

margins between continents can be either _____ or _____

active, passive

18

margins between continents can be either active or passive depending on...

tectonic activity at the margin

19

margins between continents can be either active or passive depending on ______ activity at the margin.

tectonic

20

Is there a lot of sediment deposited in the deep ocean floor?

No

21

why is there scarce sediment deposited in the deep ocean floor?

because it is too far away form any source of sediment (land)

22

what is one way that sediment reaches the ocean floor?

turbidity currents

23

turbidity currents are like ______ under the water

landslides

24

Turbidity currents can be considered as avalanches that flow down the ______ slope

continental

25

where do turbidity currents flow from?

the continental slope

26

why is the sediment layers in turbidity currents?

As the sediment flows it divides itself up into different sized particles

27

where do turbidity currents deposit their load?

At the base of the slopes

28

Is the sediment in turbidity currents more for less dense than the ocean water?

more

29

what is sediment-rich water that is denser then the rest of the ocean water and flows along the ocean floor to deposit?

turbidity currents

30

the salt content of seawater is ___ percent

3.5

- this means that if you had 100 gallons of seawater and you evaporated all of the water you would be left with about 3.5 gallons of salt