# Currents, Waves, And Tides

15 Questions  I  By Sciencerules99
Test over currents, waves, and tides aimed at sixth grade earth science students.

Changes are done, please start the quiz.

 1 What type of ocean motion is influenced by the moon and the sun?
 A. Density currents
 B. Surface currents
 C. Waves
 D. Tides
 2 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
 3 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
 4 The lowest point of a wave is the:
 A. Crest
 B. Wavelength
 C. Trough
 D. Frequency
 5 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
 6 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
 7 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
 8 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
 9 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
 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 The highest point of a wave is:
 A. Crest
 B. Wavelength
 C. Trough
 D. Frequency
 12 The wind blows on the water, passing it's energy to the water. As this energy passes through the water, in what way do the water molecules move?
 A. In waves towards the shore
 B. In a small vertical circle
 C. In the direction of the waves
 D. Against the currents
 13 ______________ water rises and ________________ water sinks
 A. Warm, cold
 B. Cold, warm
 C. None of the above
 D. All of the above
 14 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
 15 The amount of salt in a given amount of water is:
 A. Coriolis effect
 B. Salinity
 C. Density current
 D. Surface current
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