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Ocean Waves and Tides Ocean Waves and Tides

Ocean Waves and Tides - PowerPoint Presentation

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Uploaded On 2017-08-21

Ocean Waves and Tides - PPT Presentation

Waves A Wave is a rhythmic movement that carries energy through matter or space In oceans waves move through seawater Waves Caused by Wind Earthquakes Gravitational force of the Moon and Sun ID: 580835

wave tides sun moon tides wave moon sun ocean earth water wind high gravitational move tide crest waves trough

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Presentation Transcript

Slide1

Ocean Waves and TidesSlide2

Waves

A

Wave

is a

rhythmic

movement

that carries

energy

through matter or space.

In oceans, waves move through

seawaterSlide3

Waves

Caused by

:

Wind

Earthquakes

Gravitational force of the Moon and Sun.Slide4

Parts of a Wave

Crest

– highest point of a wave

Trough

– lowest point of a wave

Wave Height

– vertical distance between the crest and the trough

Wavelength

– horizontal distance between two crests or two troughsSlide5

Wavelength

Wave Height

Crest

Trough

Still Water

Wave PartsSlide6

Wave Movement

When a wave passes through the ocean,

individual water molecules move up and down but they do not move forward or backward.Slide7
Slide8

Wave Movement

When a wave breaks against the shore,

the crest outruns the trough and the crest collapses.

Called a

breaker.

In this case, water does move forward and backward.Slide9
Slide10

Waves Caused by Wind

When wind blows across a body of water,

friction

causes the water to move along with the wind.

Wave Height depends on –

Wind speed

Distance over which the wind blows

Length of time the wind blowsSlide11
Slide12
Slide13
Slide14

Tides

The rise and fall in sea level is called a

tide

.

One

low-tide/high-tide cycle takes about 12 hrs and 25 min.

Tidal range

is the

difference in ocean level

between high-tide and low-tideSlide15

The gravitational forces of the moon and sun on the water causes the tides..

The moon, being nearest, has the greatest effect even though the sun is the larger of the two.

High tides are generated on the sides of the Earth nearest to and farthest from the moon

What causes tides?Slide16

Gravitational Effect of the Moon

Two big bulges of water form on the Earth:

one directly under the moon

another on the exact opposite side

As the Earth spins, the bulges follow the moon.Slide17

During new and full moon phases the moon, sun, and Earth are aligned causing a greater gravitational pull on the Earth.

This results in higher high tides and lower low tides. Slide18

Gravitational Effect of the Sun

Spring Tides

Earth, Moon, and Sun are lined up

High Tides are higher and Low Tides are lower than normalSlide19
Slide20

Gravitational Effect of the Sun

Neap Tides

Earth, Moon, and Sun form right angles

High Tides are lower and Low Tides are higher than normalSlide21
Slide22

Ocean CurrentsSlide23

Arctic Ocean

Pacific Ocean

Atlantic

Ocean

Indian

OceanSlide24

The End