Currents, Tides, and Waves

What causes tides?

• the wind
• the sun
• the moon
• both the sun and the moon

What causes a wave to break?

• the trough slows down and the crest moves quickly
• the crest moves slowly and the trough moves quickly
• the wind blows really hard
• the waves hits a wall

In which hemisphere do the currents flow clockwise?

• Northern
• Southern

What produces waves?

• gravitational pull of the moon and sun
• wind
• earthquakes
• all of these do

Name two parts of a wave

• top and bottom
• rise and fall
• crest and trough

What is a tide?

• A tsunami
• The daily rise and fall of the Earth's water.
• The distance between two crests.

What is a tidal bulge?

• The daily rise and fall of Earth's water.
• The distance between two troughs.
• The lifting of water based on the gravitational pull of the sun&moon

The further apart waves are, the greater their wavelength.

• True
• False

A rip current is caused by an earthquake on the ocean floor.

• True
• False

Gravity is the force that causes tides.

• True
• False