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Water and Weather Chapter Seven: Oceans • 7.1 Introduction to Oceans • 7.2 Waves • 7.3 Shallow Marine Environments • 7.4 The Ocean Floor 7.4 The Ocean Floor • The ocean floor can be divided into the continental margin and the deep ocean floor. • The continental margin is the region around continents that includes the continental shelf, continental slope, and continental rise. 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. 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. 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. They are long chains of undersea mountains. • Deep-ocean trenches are the deepest parts of the ocean. Water Safety Connection Rip Currents • 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. Activity Circumnavigating the Globe • You will plot a sailboat route for circumnavigating the globe from the coast of Massachusetts to the coast of California.