Tides and waves Flashcards

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1
Q

The Continual rise and fall of water in seas and oceans

A

Tides

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2
Q

The lowest point of the water is called

A

Low Tide

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3
Q

The highest point of the water is called

A

High Tide

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4
Q

What causes Tides

A

The Gravitational pull of the moon and sun on Earth and its water

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5
Q

Does the moon or the sun have a stronger gravitational pull

A

The Moon because it is closer

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6
Q

where do High Tides occur

A

On the sides of the Earth closest to the moon and farthest away from the moon

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7
Q

What creates a High Tide

A

The moons gravity pulls the water on the side of Earth

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8
Q

What causes a bulge on the ocean farthest from the moon

A

The moon pulls the Earth closer

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9
Q

What causes Low Tides?

A

Water is pulled away from the areas not in line with the moon

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10
Q

How many High Tides and Low Tides are there in one day?

A

Two High Tides and Two Low Tides

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11
Q

Tides with Low Tides that aren’t as low and High Tides that aren’t as high as normal

A

Neap Tides

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12
Q

which Tides occur when the moon and sun are at right angles to each other

A

Neap Tides

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13
Q

How often do Neap Tides occur

A

About twice a month

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14
Q

What tides have higher high tides and lower low tides than normal.

A

Spring Tides

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15
Q

What tides result when the moon and sun line up during the full moon and new moon?

A

Spring tides

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16
Q

what is caused by the energy of the wind pushing on the surface of the water?

A

Most Waves.

17
Q

What is the highest point of the wave?

A

Crest

18
Q

The lowest point of a wave

A

Trough

19
Q

The distance between the wave crest and trough

A

Wave hight

20
Q

The distance between the crest of one wave and the crest of the next wave?

A

Wavelength

21
Q

Do water molecules move much in a wave?

A

no, they move in small circles as energy passes through them.

22
Q

Do objects floating on top of the water get pushed by the wave?

A

No, they just bob up and down.

23
Q

A wave that breaks against the shore.

A

breaker

24
Q

The giant waves are caused by earthquakes or volcanic eruptions under the sea.

A

Tsunamis

25
Q

How many fish are caught each year for food?

A

Almost 100 million tons.

26
Q

The ocean provides most of the earth __________________.

A

Oxygen.

27
Q

What is the process of desalination?

A

When the salt is removed from ocean water.

28
Q

What do we call the electric energy generated by the difference between the water level of the ocean’s high and low tides?

A

Tidal energy

29
Q

How much of the world’s oil is obtained from offshore wells?

A

about 1/4 of the world’s oil

30
Q

Name two sea-floor minerals

A

maganese, iron, copper, nickel, cobalt, and phosphates