Oceans cover 70.8% of Earth's surface and contain 97% of Earth's water. Five main oceans: Pacific, Atlantic, Indian, Antarctic/Southern, Arctic. Ocean temperature ranges from -2°C near poles to 30°C at surface
Capelin is a small forage fish found in North Atlantic, Pacific and Arctic oceans. Males reach 20 cm, females up to 25.2 cm in length. Olive-colored dorsally with silver sides and translucent male ridge
Krill are small marine crustaceans found worldwide in all oceans. Name comes from Norwegian word meaning "small fry of fish". Most species are 1-2 cm long, some reach 6-15 cm. Have bioluminescent photophores and five pairs of swimming legs
King crabs are deep-water crustaceans belonging to the Lithodidae family. They are closely related to pagurid hermit crabs. They possess five pairs of legs, including chelipeds and walking legs. Their abdomen is composed of calcified plates, with soft or hard plates
Sea urchins are spiny, globular echinoderms with five-fold symmetry. About 950 species live in oceans from intertidal to 5,000 meters. Their tests are round and spiny, typically 3-10 cm across. They move using tube feet and sometimes spines for defense
Continental shelf is submerged portion of continent under shallow shelf sea. Covers about 27 million km² area, 7% of ocean surface. Largest shelf is Siberian Shelf, stretching to 1,500 km width. Shelf break located at uniform depth of 140 m. Continental slope ranges from 1° to 10° with average angle of 3°