3.3 Ocean Dynamics

Tides are the rising and falling of the ______ of seas and oceans

• winds

• water levels

• rivers

• lakes

At high tide, the water level ________

• rises

• falls

• decreases

At low tide, the water level ________

• rises

• falls

• increases

They can be warm or cold and move like big rivers across the ocean

• tides

• low tide

• waves

• current

The moon's gravitational pull produces them

• tides

• low tide

• waves

• current

The time in a day when the level of the sea on the coast is at the lowest

• tides

• low tide

• waves

• current

Why does the water in currents not mix with the rest of the ocean?

• Because they have different discharges

• Because they have different temperatures

• Because they are going in opposite directions

• Because the air pressure above makes it impossible

Coasts with cold currents are usually

• arid

• have lots of rain and snow

• have lots of rain and no snow

Coasts with warm currents usually have

• arid

• lots of rain and snow

• lots of rain and no snow

Why are coasts with cold currents usually arid?

• Because the cold water evaporates producing dry air

• Because the cold water doesn't evaporate producing dry air