Earth's Tides

Why is the timing of tides predictable?

• because winds are predictable

• because the moon’s path is predictable

• because ocean water density is predictable

• because the sun’s movements are predictable

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NGSS.MS-ESS1-1

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Taylor and José pulled their boat up onto the beach and went on a hike. When they returned, the beach was covered by water and the boat was floating offshore. What is the most likely explanation?

• The spring tide came early.

• The water level rose due to the high tide.

• The low tide receded and pulled the boat out to sea.

• The gravitational pull of the sun and moon decreased the tidal range.

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What causes tides?

• density differences in ocean water

• heat from the sun, which causes winds

• underwater earthquakes, volcanic eruptions, or landslides

• the gravitational pull of the moon on the water at Earth’s surface

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NGSS.MS-PS2-4

What is the similarity between a neap tide and a spring tide.

• Neap tides occur once a year in the fall and   spring tides occur once a year during spring.

• Each occurs twice a year and relates to the phases of the moon.

• A neap tide occurs at night and a spring tide occurs during the day

• Each tide occurs twice a month     

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NGSS.MS-ESS1-1

How are the sun, Earth, and the moon aligned when spring tides occur?

• The sun, Earth, and the moon form a straight line.

• The sun, Earth, and the moon form a 45-degree angle.

• The sun, Earth, and the moon form a 90-degree angle.

• The sun, Earth, and the moon form a 135-degree angle.

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NGSS.MS-ESS1-1

_____ are the daily changes in the level of ocean water

• Surface Currents  

• Tides

• Waves

• Deep Currents

Water level at the absolute highest level?

• Neap Tide

• Low Tide

• High Tide

• Spring Tide

What type of tides would this arrangement of Earth-Moon-Sun create?

• neap tide

• spring tide

• new moon tide

• full moon tide

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NGSS.MS-ESS1-1

Tides are caused by gravitational forces between the:   

• Moon and Earth

• Earth and Sun

• Sun and the moon

• Moon, Sun and Earth

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The figure below illustrates ocean water levels in a location on the Florida coast.

What is the tidal range in this location?

• –1 m

• 0 m

• +1 m

• 2 m

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