| A | B |
|---|
| abyssal plain | a smooth,nearly flat region of the deep ocean floor |
| atoll | a ring-shaped coral island found far from land |
| aquaculture | the practice of raising fish andother saltwater and freshwater organisms for food |
| benthos | organisms that live on the bottm of the ocean or other body of water |
| bioluminescene | the production of light by a living organism |
| continental shelf | a gently sloping shallow area of the ocean floor that extends outward from the edge of a continent |
| continental slope | an incline leading down from the edge of the continental shelf |
| food web | the pattern of overlapping food chains in an ecosystem; indicates the feeding relationships in a habitat |
| holdfast | a bundle of rootlike strands that attaches algae to the rocks |
| hydrothermal vent | an area wherre ocean water sinks through cracks in the ocean floor,is heated by the underlining magma, and rises again through the cracks |
| intertidal zone | the area on a seashore between the highest high tide line and the lowest low tide line |
| longshore drift | the movement of water and sediment along a beach caused by waves coming into shore at an angle |
| mid-ocean ridge | the undersea mountain chain where new ocean floor is produced; a diverrgent plate boundary |
| nekton | free swimming animals that can move throughout the water column |
| nodules | a black,potao-shaped lump formed when metals build up around pieces of shell on the ocean floor |
| open- ocean zone | the area of the ocean beyond the edge of the continental shelf |
| neap tide | a tide with the least difference between low and high tide that occurs when the sun and moon pull at right angles to each other |
| neritic zone | the region of shallow ocean water that extends from the low-tide line out to the edge of the continental shelf |
| plankton | tiny algea and animals that float in water and are carried by waves and currants |
| sandbar | a ridge of sand deposited by by waves as they slow down near shore |
| seamont | a mountain on the ocean floor that is completely underwater |
| sonar | a system that determines the distance of an object under water by recording echoes of sound waves;gets its name from sound navigation and ranging |
| spring tide | a tide with the greatest difference between high and low tide that occurs when the sun and the moon are in a line with Earth |
| tides | the daily rise and fall of Earth's waters on shores |
| trench | a deep canyon in the ocean floor |
