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
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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.Slide7Slide8
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.Slide9Slide10
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 blowsSlide11Slide12Slide13Slide14
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 normalSlide19Slide20
Gravitational Effect of the Sun
Neap Tides
Earth, Moon, and Sun form right angles
High Tides are lower and Low Tides are higher than normalSlide21Slide22
Ocean CurrentsSlide23
Arctic Ocean
Pacific Ocean
Atlantic
Ocean
Indian
OceanSlide24
The End