Tides

Which of the following is a true statement about gravity?

• It acts on all matter in the universe.
• It pushes objects away from one another.
• It does not exist in outer space.
• It gets weaker the closer you get to the sun.

If the sun is bigger than the moon, why does the moon have a greater effect on tides?

• The sun's gravity doesn't affect water.
• The moon is much closer than the sun.
• Although the moon is smaller than the sun, it has more mass.
• The earth blocks the sun's gravitational pull.

High tides occur:

• At either the North Pole or South Pole, depending on location of the moon.
• On the side of the earth facing away from the moon only.
• On the side of the earth facing the moon only.
• On the side of the earth facing the moon, and also the opposite side.

At one beach, high tide occurs at 8am.  When will the next high tide most likely occur?

• Noon
• 4pm
• 8pm
• 8am the next day

What might happen if the moon were only half as large as it is now?

• There would be no tides.
• Most areas would receive fewer high tides each day.
• The ocean level would rise and fall less dramatically.
• Ocean waves would not be very large.

The moon's gravity affects:

• Both the solid parts of the earth and the oceans.
• The solid part of the earth only.
• The oceans only.
• The moon only.

Differences in the moon's and sun's pull on different sides of the Earth cause _________.

• gravity
• lunar phases
• tides
• dabbing

The bulge of water on the side of the Earth closest to the moon produces ___________.

• high tide
• low tide
• neap tide
• spring tide

Tides are the cycle of rising and falling ocean water that repeats automatically every

• 24 hours
• 12.5 hours
• 25 hours
• 6.25 hours

What is a difference between spring and neap tides?

• Spring tides occur when the earth and sun are IN LINE with the new or full moon. 
• Spring tides occur when moon in 3rd or 1st quarter phases
• Spring tides are LOWER than neap tides
• Spring tides occur in Spring and neap tides can occur in any season