Crash Course: Tides

Front

What is the average distance from the surface of the Earth to its center?

Back

About 6,400 km.

Front

What is the overall effect of the tidal force on an object?

Back

It stretches the object.

Front

How long does it take for spring tides to transition to neap tides?

Back

About a week.

Front

What do we call the state where the tidal force is weakest?

Back

Low tide.

Front

From where do we measure gravity when calculating its effect?

Back

From the center of mass of an object.

Front

What are spring tides?

Back

Spring tides are the highest and lowest tides that occur when the Earth, moon, and sun are aligned.

Front

What are neap tides?

Back

Neap tides are the lower high tides and higher low tides that occur when the moon is at a right angle to the sun.

Front

What causes tides on Earth?

Back

Tides are caused by the gravitational pull of the moon and the sun on Earth's oceans.

Front

What is the difference between high tide and low tide?

Back

High tide is when the water level is at its highest, while low tide is when the water level is at its lowest.

Front

How often do tides occur?

Back

Tides typically occur twice a day.