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Grade-7 Ocean currents

Total questions: 25

Worksheet time: 20mins

Name
Class
Date
1.
Where is ocean water the densest.
a)
The surface
b)
The middle
c)
The bottom
d)
Lake Michigan
2.

What affects the density of water?

a)

Salt

b)

Temperature

c)

The seasons of the year

d)

Both A and B

3.
Surface currents are mainly caused by
a)
The Coriolis Effect
b)
Cold and Warm Water
c)
Convection
d)
Wind
4.
Water in the ocean is always
a)
Moving
b)
Still
c)
Warming up
d)
Cooling down
5.
Air moves from _______ pressure to _______ pressure.
a)
Low, High
b)
High, Low
c)
Warm, Cold
d)
Cold, Warm
6.
What causes wind to blow?
a)
Animal movement
b)
Similar air temperatures
c)
A giant blowing out candles
d)
Differences in air temperature
7.
Warm water is ________ dense and _________ than cold water
a)
More, Heavier
b)
Less, Heavier
c)
Less, Lighter
d)
More, Lighter
8.
Based on the illustration, which of the following statements describes the relationship between density and temperature? 
a)
Cold water is denser than warm water
b)
Warm water is denser than cold water
c)
Warm and cold water equal densities
d)
The density of water is not affected by temperature
9.
What two factors determine the density of water in deep currents? 
a)
Salinity and temperature
b)
Coriolis Effect and wind
c)
Upwelling and dissolved solids
d)
Continental deflection and convection
10.

The part of the Earth that is covered in water is known as the ______________.

a)

Ozone Layer

b)

Hydrosphere

c)

Atmosphere

d)

Icebergs

11.

There are __________ major oceans in the world.

a)

Four

b)

Five

c)

Three

d)

Six

12.

The ___________ Ocean is the largest and deepest ocean of the world.

a)

Pacific

b)

Indian

c)

Arctic

d)

Southern

13.

The ___________ Ocean is the only ocean in the world that is named after a country.

a)

Arctic

b)

Indian

c)

Pacific

d)

Atlantic

14.

Which of the following oceans is between Africa and Australia?

a)

Indian Ocean

b)

Arctic Ocean

c)

South Atlantic Ocean

d)

South Pacific Ocean

15.

The oceans cover______of the surface of the Earth.

a)

50%

b)

60%

c)

71%

d)

80%

16.

The North Pole lies in the middle of which ocean?

a)

Pacific Ocean

b)

Arctic Ocean

c)

Atlantic Ocean

d)

Southern Ocean

17.
Study the graph below.  Where is most of the Earth's water located?
a)
Rivers and Lakes
b)
Glaciers and Icecaps
c)
oceans
d)
groundwater
18.

A body of running water that usually finish in a lake or in an ocean.

a)

River

b)

Pond

c)

Lake

19.
Study the graph below.  Where is most of the Earth's water located?
a)
Rivers and Lakes
b)
Glaciers and Icecaps
c)
oceans
d)
groundwater
20.

What kind of water does an Ocean have?

a)

Fresh water

b)

Warm water

c)

Salty water

21.

What kind of water does a river have?

a)

Salty water

b)

Fresh Water

c)

cold and dirty water

22.

Earth's nickname is the "Blue Planet" because 70% of its surface is ___.

a)

ice

b)

water

c)

sky

d)

land

23.

What causes pollution?

a)
b)
c)
24.

The rise and fall of Earth's waters on its coastlines are called

a)

currents

b)

tides

c)

waves

d)

gravity

25.

The development of a wave usually begins with

a)

currents

b)

wind

c)

gravity

d)

tsunamis