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Chapter 2 oceans
| Term | Definition |
|---|---|
| Salinity | The total amount of dissolved salts in a water sample. |
| Sonar | A system that uses reflected sound waves to locate and determine the distance to objects under water. |
| Seamount | A steep-sided volcanic mountain rising from the deep-ocean floor. |
| Trench | A deep, steep-sided canyon in the ocean floor. |
| Continental slope | A steep incline of the ocean floor leading down from the edge of the continental shelf. |
| Continental shelf | A gently sloping, shallow area of the ocean floor that extends outward from the edge or a continent. |
| Abyssal plain | A smooth, nearly flat region of the deep ocean floor. |
| Mid-ocean ridge | An undersea mountain chain where new ocean floor is produced; a divergent plate boundary under the ocean. |
| Wave | A disturbance that transfers energy from place to place. The movement of energy through a body of water. |
| wavelength | The distance between two corresponding parts of a wave, such as the distance between two crests. |
| tsunami | A giant wave usually caused by an earthquake beneath the ocean floor. |
| frequency | The number of complete waves that pass a given point in a certain amount of time. |
| wave height | The vertical distance from the crest of a wave to the trough. |
| longshore drift | The movement of water and sediment down a beach caused by waves coming in to shore at an angle. |
| rip current | A strong, narrow current that flows briefly from the shore back toward the ocean through a narrow opening. |
| groin | A wall made of rocks or concrete that is built outward from a beach to reduce erosion. |
| current | A large stream of moving water that flows through the oceans. |
| Coriolis effect | The effect of Earth's rotation on the direction of winds and currents. |
| climate | The average annual conditions of temperature precipitation winds and clouds in an area. |
| El Nino | In abnormal climate event that occurs every 2 to 7 years in the Pacific Ocean causing changes in winds currents and weather patterns for 1 to 2 years. |
| La Nina | A climate event in the Eastern Pacific Ocean in which surface waters are colder than normal. |
| Intertidal zone | An area between the highest high tide line on land and the point on the continental shelf exposed by the lowest low tide line. |
| neritic zone | The area of the ocean that extends from the low tide line out to the edge of the Continental shelf. |
| Open-ocean zone | The deepest darkest area of the ocean Beyond the Edge of the continental shelf. |
| plankton | Tiny algae and animals that float in water and are carried by waves and currents. |
| nekton | Free swimming animals that can move throughout the water column. |
| benthos | Organisms that live on the bottom of the ocean or another body of water. |
| food web | The pattern of overlapping feeding relationships or food chains among the various organisms in an ecosystem. |