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Composition: Shells and skeletons of marine organisms. Location: Deep sea floor, especially at mid-ocean ridges.

Composition: Mineral fragments from continental rocks. Location: Continental shelves, slopes, and abyssal plains.

Composition: Fine particles of clay and microscopic iron and manganese. Location: Deep ocean basins, far from land.

Composition: Particles from space, such as meteorite debris. Location: Distributed throughout the ocean floor.

Composition: Volcanic ash and particles from volcanic eruptions. Location: Found near active volcanic islands and along mid-ocean ridges.

Composition: Biogenous sediment made up mostly of calcium carbonate from organisms. Location: Common in shallow, warm marine waters.

Composition: Rock flour, pebbles, and other debris transported by ice. Location: Found in areas influenced by past or current glaciation.