Oceans
description
Transcript of Oceans
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Oceans
Water, Waves & Underwater Ocean
features
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What does the bottom of the ocean look like?
Covered in sand?
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Covered in
Plants?
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Covered with Mountains?
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Features of The Ocean Floor
• The landscapes found deep beneath the ocean are as dramatic as any found onshore!
Jagged Peaks
muddy plainsMountains
Trenches
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Basin• Low• Flat• Abyssal Plain
– are made of fine sediments that have been washed off the surface of the continents for thousands of years.
Continental rise•Moving upwards towards shore
•Made of a mixture of sediments
•Turbidity!!! --- Small underwater avalanches of sand and sediment •Less habitats
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Continental Slope
• Steepest!!!!• Minimal Habitats
Continental Shelf•Shallowest•What we see/walk on when we go to the beach•Lots of Habitats and Creatures•Warmer water ( sunlight)•Like a shelf !!........ before it drops off into deep ocean
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Trench• Underwater canyon • Deepest places on
Earth• Coldest
Seamounts•Underwater Mountains and Volcanoes •Those that surface above water are known as volcanic islands• Hawaii
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What about Landforms above water created by the ocean?
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Barrier Islands• Barrier islands are constantly on the move.• Migrating under the influence of changing – sea levels– storms– waves– tides – longshore currents.
**They form when sediments piles up on itself and eventually reaches the surface.
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Barrier Islands
• They move in a rolling fashion along the coastline.
Sediment deposits on the back side
Barrier island grows & elongates
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Now that we know what is under the water, lets look at the water
characteristics & see how that water moves…..
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Ocean Water Characteristics
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Waves• A Wave is a rhythmic movement that carries
energy through matter or space.
• In oceans, waves move through seawater
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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 troughs
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Wave Motion• When a wave passes through the ocean,
individual water molecules move up and down but they do not move forward or backward.
http://www.youtube.com/watch?v=bQrj0DNXjMYhttp://www.youtube.com/watch?v=7yPTa8qi5X8&feature=related
Hey Guys, watch these videos!
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So if a WAVE is the movement of energy…..Where does the energy come from?
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Wind• Wind blows across the water’s surface
creating shear force
Fetch- the distance the wind can blow over the water
* The longer the fetch length and the faster the wind speed, the larger and stronger the wave will be.