Chapter Seven: Oceans
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Transcript of Chapter Seven: Oceans
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Chapter Seven: Oceans
• 7.1 Introduction to Oceans
• 7.2 Waves
• 7.3 Shallow Marine Environments
• 7.4 The Ocean Floor
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7.4 The Ocean Floor• Many of the important features of the oceans are
hidden in deep water.• The continental margin is the region around
continents that includes the:– continental shelf,– continental slope, and– continental rise.
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7.4 Features of the ocean floor• Maps can show the
location of the continental shelf (light blue areas).
• The true ocean floor is called the abyssal plain. (dark blue)
• It is flat and smooth because a thick layer of sediment covers its features.
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7.4 The deep ocean floor• A barrier island is a
low, sandy island that lies parallel to the shoreline.
• A bank is a low, flat region on the continental shelf.
• A seamount is a steep-sided mountain that rises from the ocean floor.
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7.4 The deep ocean floor• A guyot is a seamount
that has eroded so that it has a flat top and is underwater.
• Mid-ocean ridges mark places where two tectonic plates are separating and new ocean crust is being made.
• Deep-ocean trenches are the deepest parts of the ocean.
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Water Safety Connection
• Rip currents can cause a swimmer to be pulled out to sea.
• A rip current forms when water piles up near the shore and moves away from the shore all at one time.
Rip Currents
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Activity • You will plot a sailboat route for circumnavigating the globe from the coast of Massachusetts to the coast of California.
Circumnavigating the Globe