Currents, Waves, And Tides
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Test over currents, waves, and tides aimed at sixth grade earth science students.
- 1.
- A.
In waves towards the shore
- B.
In a small vertical circle
- C.
In the direction of the waves
- D.
Against the currents
- 2.The lowest point of a wave is the:
- A.
Crest
- B.
Wavelength
- C.
Trough
- D.
Frequency
- 3.The highest point of a wave is:
- A.
Crest
- B.
Wavelength
- C.
Trough
- D.
Frequency
- 4.When the wind blows across a body of water (like the ocean), ________________ between the water and air causes the water to move.
- A.
Ions
- B.
Gravity
- C.
Friction
- D.
Density
- 5.The size of a wave is NOT affected by the:
- A.
Length and time the wind blows across the water
- B.
Salinity of the water
- C.
Strength of the wind (how hard the wind is blowing)
- D.
Distance the wind blows across the water
- 6.This occurs when circulation in the ocean brings deep, cold water to the ocean surface:
- A.
Rotation of the earth
- B.
Density
- C.
Coriolis effect
- D.
Upwelling
- 7.______________ water rises and ________________ water sinks
- A.
Warm, cold
- B.
Cold, warm
- C.
None of the above
- D.
All of the above
- 8.The amount of salt in a given amount of water is:
- A.
Coriolis effect
- B.
Salinity
- C.
Density current
- D.
Surface current
- 9.What causes the currents to curve instead of moving in straight lines?
- A.
The moon's gravity
- B.
Wave height
- C.
Coriolis effect
- D.
Density currents
- 10.What is the main cause of the gulf steam?
- A.
Storms
- B.
Winds that blow now and then
- C.
Winds that blow in regular directions all the time
- D.
The moon's gravity
- 11.Density currents are caused by:
- A.
Differences in temperature
- B.
Differences in salinity
- C.
The moon's gravity
- D.
A and B are both correct
- 12.What type of ocean motion is influenced by the moon and the sun?
- A.
Density currents
- B.
Surface currents
- C.
Waves
- D.
Tides
- 13.Surface currents are caused by
- A.
Wind that blows every now and then
- B.
Wind that blows in regular directions
- C.
The moon's gravitational pull
- D.
Differences in salinity and temperature
- 14.When the sun, moon, and earth are all aligned (in a straight line), you have a
- A.
Density current
- B.
Neap tide
- C.
Surface current
- D.
Spring tide
- 15.The sun's rays are strongest at the____________ and weakest at the _______________:Hint: the stronger the rays, the hotter it gets!!!
- A.
Equator, poles
- B.
Poles, equator
- C.
Ocean floor, ocean surface
- D.
Midocean ridge, continental shelf
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