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Harris Ch 18-19 voca

Science Chapter 18-19 Vocab Words

QuestionAnswer
Basin- low area on Earth in which an ocean formed when the area filled with water from torrential rain.
Salinity- a measure of the amount of salts dissolved in seawater.
Surface current- wind-powered ocean current that moves horizontally-parallel to Earth’s surface-and moves only the upper few hundred meters of seawater.
Coriolis Effect- causes moving air and water to turn left in the southern hemisphere and turn left in the northern hemisphere due to the Earth rotation.
Upwelling- Circulation in the ocean that brings deep, cold water to the ocean surface.
Density current- circulation pattern on the ocean that forms when a mass of more dense seawater sinks beneath less dense water.
Wave – Rhythmic movement that carries energy through matter or space; can be described by its crest, trough, wave-length, and wave height.
Crest- highest point of the wave.
Trough lowest point of a wave
Breaker collapsing ocean wave that forms in shallow water and breaks into the shore.
Tide- daily rise and fall in sea level caused, for the most part, by the interaction of gravity in the Earth-Moon system.
Tidal range- the difference between the level of the ocean at high tide and the level at low tide.
Continental shelf- gradually sloping end of a continent that extends beneath the ocean and provides a home for most marine organisms.
Continental slope- ocean basin feature that dips steeply down from the continental shelf.
Abyssal Plain- flat seafloor area from 4,000m to 6,000m below the ocean surface, formed by the deposition of sediments.
Mid-Ocean ridge -Area where new oceans floor are formed when lave erupts through the cracks in the Earth’s crust.
Trench - long, narrow, steep-sided depression, in the seafloor formed where one crustal plate sinks beneath another.
Photosynthesis- Food making process using light energy from the Sun, carbon dioxide and water.
Chemosynthesis -food making process using sulfur or nitrogen compounds, rather than light energy from the Sun that is used by bacteria living near thermal vents.
Plankton - marine plants and animals that drift into ocean currents.
Nekton -marine organisms that actively swim in the ocean.
Benthos - marine plants and animal that live on or in the ocean floor.
Estuary - area where a river meets the ocean that contains a mixture of freshwater and ocean water and provides an important habitat to many marine organisms.
Reef - ridged, wave-resistant, ocean margin habit built by corals from skeletal materials and calcium.
Pollution - introduction of wastes to an environment, such as sewage and chemicals that can damage organisms.
Created by: marcrobertdillon
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