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| the flattest features of the ocean floor, created when currents deposited sediments on the seafloor and filled in valleys |
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| the food-making process of certain deep-dwelling, ocean bacteria that use elements such as iron, sulfur, or nitrogen to produce food |
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| plants, animals, and algae that live on or near the ocean floor and are either mobile or permanently attached to the bottom |
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| all organisms that actively swim throughout the ocean |
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| the process by which chlorophyll-containing land plants and chlorophyll-containing ocean organisms use energy, carbon dioxide, and water to produce food |
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| a rigid, wave-resistant structure built from skeletal material and calcium carbonate |
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| long, narrow, steep-sided depression in the ocean floor formed where one crustal plate is forced under another. They are the deepest most geologically active places on Earth |
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| the place where new ocean floor forms as a result of volcanic eruptions and molten lava moving up through rifts |
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| a sharp drop-off that extends from the outer edge of the continental shelf down to the ocean floor |
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| a gradually sloping end of a continent that extends out under the ocean for varying distances |
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| tiny marine algae and animals that drift with ocean currents |
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