Lesson 7: Changes in Motion (Tides)

When does the edge of the water advance farther inland—when the ocean’s floor is a gradual slope or a steep slope? Why?

• When the ocean's floor is a gradual slope

• When the ocean's floor is a steep slope

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NGSS.MS-ESS2-4

What are some phenomena that can make the ocean level change at certain locations?

• Tides and weather conditions

• Only weather conditions

• Only tides

• None of the above

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NGSS.MS-ESS2-6

Can a high tide occur everywhere in the world at the same time?

• Yes; pull of the moon affects the entire Earth simultaneously.

• No; the timing of high tides depends on the location of the sun

• Yes; Earth's rotation ensures synchronized tides everywhere

• No; water from high tides comes for places currently at low tide.

Which force is greater—Earth’s gravitational pull on the moon or the moon’s gravitational pull on Earth?

• Earth’s gravitational pull on the moon is greater.

• The moon’s gravitational pull on Earth is greater.

• Both forces are equal.

• Cannot be determined from the given information.

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NGSS.MS-ESS1-2

NGSS.MS-PS2-4

The football shape of water around the Earth is caused by:

• gravitational forces

• magnetic fields

• ocean currents

• wind patterns

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NGSS.MS-ESS1-2

NGSS.MS-PS2-4

Explain why there are two high and two low tides every day.

• Due to the gravitational pull of the sun.

• Because of the Earth's rotation over 24 hours

• As a result of ocean currents.

• Caused by wind patterns.

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NGSS.MS-ESS1-1

NGSS.MS-PS2-4

Beaches on the Great Lakes, Salt Lake, and Lake Tahoe do not have tides because:

• They need to cover about 1/4 of the Earth

• They are freshwater bodies.

• They are located at high altitudes.

• They are surrounded by ice