Understanding Ocean Tides and Gravity

What is the movement of ocean water called when it rises and falls twice each day?

• Waves

• Currents

• Tides

• Swells

How many times does the ocean water typically rise and fall each day due to tides?

• Once

• Twice

• Three times

• Four times

What is the highest point the ocean water reaches called?

• Low tide

• Mid tide

• High tide

• Peak tide

What is the lowest point the ocean water reaches called?

• High tide

• Low tide

• Deep tide

• Bottom tide

What is the main reason for tides in Earth's oceans?

• The Sun

• Earth's rotation

• The Moon

• Ocean currents

What is gravity?

• The force that pushes objects away from each other.

• The force that makes objects float in water.

• The force that pulls objects towards the center of a planet or other body.

• The force that causes wind to blow.

What causes the ocean water to bulge towards the Moon?

• Earth's rotation

• Tidal force

• Solar winds

• Ocean currents

Why does Earth experience two high tides each day?

• The Sun's gravity pulls on the ocean water.

• Earth rotates, and the tidal force causes water to bulge on two sides of the planet.

• Strong winds push the water to two different sides.

• Underwater volcanoes cause the water to rise in two places.