Currents, Tides, Waves Surface currents – move horizontally or parallel to the earth’s - PowerPoint Presentation

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Currents, Tides, WavesSlide2

Surface currents – move horizontally or parallel to the earth’s surface

Created by WindsSlide3

Coriolis Effect- The shifting of ocean currents and surface winds from their expected paths caused by the rotation of the earthSlide4

Gulf Steam – ocean current in the northern Atlantic ocean, brings warm water from Africa to the AmericasSlide5

Upwelling – a vertical circulation in the ocean that brings deep, cold water to the ocean surface. Winds carry surface water away from the continents and leaves a void at the coast. This void is filled by deep cold water being pulled upward.Slide6

Density Current – gravity pulling more dense water downward, density increases if salinity increases or temperature decreases.Slide7

Wave – a rhythmic movement that carries energy through matter or space

Parts of a wave

Trough- the lowest part of a waveCrest- the highest part of a waveWave height - a measure from the lowest point to the highest pointSlide8

Wave diagramSlide9

How are waves formed?

Wind blows across the surface of the water, the wind energy is transferred to the water

If the wind energy is high enough it piles up the water – “white caps”more wind energy creates higher wavesSlide10

Tides

Tides are the rise and fall of sea level due to the gravitational pull of the moonSlide11

Special tides

Spring Tide – when the sun, moon and earth are all lined up in a row. High tides are high, low tides are lower

Neap tide – when the moon earth and sun are at a 900 angle. High tides are lower and low tides are higherSlide12