Moon-Tide Review

Tides are caused primarily by

• The force of gravity from the Sun acting on the Earth's oceans.

• The force of gravity from the Moon acting on the Earth's oceans.

• The force created by the rotation of the Moon on its axis.

• The force created by the rotation of the Earth on its axis.

Select the correct reason for why the Moon has a greater impact on the tides than the Sun does.

• The sunlight reflecting off the moon focuses the energy like a laser. This heats the oceans and causes them to expand.

• The Moon is orbiting the same direction that the Earth is spinning, this pushes the oceans out.

• Even though the Moon is much more massive, the Sun is much closer.

• Even though the Sun is much more massive, the Moon is much closer.

What does the rotation of the earth have to do with tides?

• The centripetal force pushes the oceans in and out.

• It causes a single point to rotate through two tidal bulges each day.

• The rotation of the earth pushes the moon in its orbital path and causes tides.

• The spinning earth creates a daily vortex in the center of the ocean pulling the shore line in temporarily.

F=force of gravity, m=mass (of the two bodies interacting), and r=radius (distance). How might this equation help us why the moon impacts tides more than the sun.

• Force of gravity is completely different from gravity and the equation is irrelevant.

• Since all of it is multiplied by the gravitational constant, the answer is going to be the same for both.

• Since the masses of the two objects are multiplied, the mass of the moon is not significant compared to the sun.

• Since the right side is divided by the distance squared, distance has a greater impact than mass.

What picture correctly depicts a spring tide.

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What type of tide occurs when the force of gravity from the sun works against the force of gravity of the moon?

• Spring

• Summer

• Neap

• Weak

What one has circled the dates that likely represent quarter moon phases.

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What response helps explain why tides do not occur at the exact same time each day?

• Dinosaur teeth on the moon.

• Climate change causes constantly changing ocean patterns.

• Ocean currents drive circulation that disrupts tidal patterns.

• A solar day and a lunar day are different lengths.

A solar day is longer than a lunar day.

• True

• False

Of the three types of tidal patterns, what one is defined by two roughly equal high and low tides per day?

• Diruanal

• Semidiurnal

• Mixed Semidiurnal