Ocean Water and Sea Basins

Question 1

Oceans cover __ percent of the Earth’s surface

Answer 1

70

Question 2

The ____ of ocean water is still under scientific debate

Answer 2

origin

Question 3

The land on the globe is concentrated in the ______ hemisphere

Answer 3

northern

Question 4

The Southern Hemisphere is primarily…

Answer 4

oceans with very little land

Question 5

which hemisphere contains all of our major continents?

Answer 5

northern

Question 6

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

Answer 6

Yes

Question 7

the uneven _____ of land affects large scale ocean water ______

Answer 7

distribution, circulation

Question 8

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

Answer 8

Pacific, Indian, Atlantic, and Southern

Question 9

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

Answer 9

very simple

Question 10

As the continents split apart, ocean currents became more…

Answer 10

complex

Question 11

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

Answer 11

• Marianas Trench

- 11km at its deepest. 4.5 km average

Question 12

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

Answer 12

shelves, slopes, floor

Question 13

What is the ocean floor also called?

Answer 13

the abyssal plain

Question 14

Oceanic crust, on average, is ______ then continental crust

Answer 14

younger

Question 15

How old is the oldest oceanic crust?

Answer 15

200 million years

Question 16

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

Answer 16

renewed, destruction, formation

Question 17

margins between continents can be either _____ or _____

Answer 17

active, passive

Question 18

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

Answer 18

tectonic activity at the margin

Question 19

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

Answer 19

tectonic

Question 20

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

Answer 20

No

Question 21

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

Answer 21

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

Question 22

what is one way that sediment reaches the ocean floor?

Answer 22

turbidity currents

Question 23

turbidity currents are like ______ under the water

Answer 23

landslides

Question 24

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

Answer 24

continental

Question 25

where do turbidity currents flow from?

Answer 25

the continental slope

Question 26

why is the sediment layers in turbidity currents?

Answer 26

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

Question 27

where do turbidity currents deposit their load?

Answer 27

At the base of the slopes

Question 28

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

Answer 28

more

Question 29

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

Answer 29

turbidity currents

Question 30

the salt content of seawater is ___ percent

Answer 30

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

Question 31

The salt material in oceans comes from the ______ or rock and ______ to sea by rivers

Answer 31

weathering, transport

Question 32

Can volcanic activity add salt to seawater?

Answer 32

yes

Question 33

evaporation and freezing tend to _____ in sea water

Answer 33

concentrate

Question 34

why does evaporation and freezing tend to concentrate in sea water?

Answer 34

because when water evaporates or freezes it tends to leave the salt behind

Question 35

when water evaporates in an ocean basin, only the ____ evaporates and the _____ is left behind

Answer 35

water, salt

Question 36

How can slat be removed from the ocean?

Answer 36

by biological organisms who use it in their metabolism or to make their shells.

Question 37

Seawater is diluted by…

Answer 37

freshwater influx from precipitation and rivers

Question 38

freshwater can travel far into the ocean before it completely ______ with the ocean water

Answer 38

disseminates