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Oceans. Water, Waves & Underwater Ocean Features. What does the bottom of the ocean look like?. Covered in sand?. Covered in Plants?. Covered in Mountains?. Lets Take A Look. http://www.youtube.com/watch?v=vpyNtxPReaw. Features of the Ocean Floor.
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Oceans Water, Waves & Underwater Ocean Features
What does the bottom of the ocean look like? Covered in sand?
Lets Take A Look http://www.youtube.com/watch?v=vpyNtxPReaw
Features of the Ocean Floor • The landscapes found deep beneath the ocean are as dramatic as any found onshore! JaggedPeaks muddy plains Trenches Mountains
Basin • Low • Flat • Also called an Abyssal Plain
Abyssal Plain • ● An underwater plain on the deep ocean floor, usually between 3000 and 6000 m. • ● Lying generally between a continental riseand a mid-ocean ridge, abyssal plains cover more than 50% of the Earth’s surface. • ● They are among the flattest, smoothest and least explored regions on Earth.
Continental rise • Moving upwards towards shore • Made of a mixture of sediments • Turbidity!!! --- how clean or dirty the water looks • Murkiness is caused by small underwater avalanches of sand and sediment • Less habitats
Continental Slope ●Steepest!!!! ●Minimal Habitats
Continental Shelf • Shallowest • What we see when we go to the beach • Lots of Habitats and Creatures • Warmer water (sunlight) • Like a shelf !!........ before it drops off into deep ocean
Trench ●Underwater canyon ●Deepest places on Earth ●Coldest
Seamounts • Underwater Mountains and Volcanoes • Those that surface above water are known as islands • Hawaii
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 sediment piles up on itself and eventually reaches the surface.
Now that we know what is under the water, lets look at the water characteristics & see how that water moves…..
Ocean Water ●Salinity Amount of dissolved particles in the water ●Usually measures salt ●Parts per/thousands = 35 per 1000 • Temperature • Decreases with increasing depth
Waves ●A Wave is a rhythmic movement that carries energy through matter or space. ●In oceans, waves move through seawater
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
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=bQrj0DNXjMY http://www.youtube.com/watch?v=7yPTa8qi5X8&feature=related
So if a WAVE is the movement of energy …..Where does the energy come from?
Wind • Wind blows across 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.
Currents & Tides • Gravitational forces caused by the Moon’s pull…… • Deep ocean circulation…… • Next Class!!!
Quiz Vocabulary • Abyssal Plain • Turbidity • Continental Slope • Continental Shelf • Trench • Seamounts • Barrier Islands • Salinity • Wave • Crest • Trough • Wave Height • Wavelength • Fetch