Tides intro!

The reversing of St. John River is caused by ocean tides.

This is the Bay of Fundy the river is part of that system.

What are Tides?

Word Cloud

What do you think of when you hear the word TIDE?

The rise & fall of ocean water that occurs every 12.5 hours or so. The water rises for 6 hours and then falls for 6 hours.

Tide

The force of gravity pulls the moon & Earth (including the water on Earth's surface) toward each other!

Gravity

mainly by differences in how much gravity from the moon and the sun pulls on different parts of Earth.

​​Tides are caused...

​The Tide Cycle

This also means there are 2 places with low tides!

There are 2 places with high tides!

1 high tide occurs on the side of the Earth that faces the moon. A 2nd high tide occurs on the opposite side of Earth. (Look where the low tides are!)

As Earth rotates...

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Which point would be a high tide?

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Which point would be a low tide?

The Sun's Role in Tides.

Changes in the position of the Earth, the moon, and the sun affect the heights of the tides during a month.

Spring tides occur. These are tides with the biggest difference between high and low tides.

​

During a new or full moon...

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Which 2 positions of the moon around the Earth would cause spring tides to occur?

Neap tides occur. These are tides with the least difference between high & low tides.

During a 1st quarter or 3rd Quarter moon...

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Which 2 positions of the moon around the Earth would cause neap tides to occur?

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In 1 or 2 words, what causes tides?

Multiple Choice

High and low tides are caused by:

• the Moon's gravitational pull

• periodic powerful tsunami waves

• water sloshing around due do Earth's elliptical orbit

• powerful thunderstorm winds

Multiple Choice

Which response best explains changing tides on Earth:

• The Moon circles the Sun and then pauses to make a tidal bulge. The bulge is high tide.

• The Earth rotates and different regions are pulled into the bulge created by the Moon's gravitational pull.

• The periodic earthquakes from the mid-ocean ridge send micro-tsunami twice per day to coastlines around the world.

• Powerful thunderstorms form twice a day in the middle of the oceans, these send powerful waves to coastlines.

Labelling

Determine the tide that each region would be experiencing:

Drag labels to their correct position on the image

High tide

Low tide

Drag and Drop

A region on Earth that enters a tidal bulge will experience a ​

Placeholder

Drag these tiles and drop them in the correct blank above

high tide

low tide

tsunami

heat wave

microburst

algal bloom

Drag and Drop

A region on Earth that leaves a tidal bulge will experience a ​

Placeholder

Drag these tiles and drop them in the correct blank above

high tide

low tide

tsunami

heat wave

microburst

algal bloom