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Oceans Study Guide
Mrs.Tate's 8th grade quiz study guide
Question | Answer |
---|---|
Salinity | The measure of the amount of dissolved salts in a given amount of liquid. Measured in parts per thousand (ppt) |
Thermocline | A layer in a body of water in which water temperature drops with increased depth faster than other layers. |
Pack ice | A floating layer of sea ice that completely covers an area of the ocean surface. |
Density | The ratio of the mass of a substance to the volume of the substance. Measured in g/cm3 (solids) g/mL (liquids) |
What are three main dissolved gases found in ocean water? | Nitrogen (N2) Oxygen (O2) Carbon dioxide (CO2 |
What are the four ways that gases can enter the ocean water? | 1. From streams and rivers 2. Underwater volcanoes 3. From the atmosphere 4. Given off by marine organisms |
What is the relationship between water temperature and the amount of dissolved gases it contains? | Colder water contains more dissolved gases. |
What is the relationship between the temperature and density of ocean water. | Colder water is more dense. |
What are the two factors that influence the salinity of ocean water? | Precipitation and evaporation. |
Surface current | A horizontal movement of ocean water that is caused by wind, and that occurs at or near the ocean surface. |
Deep current | A stream like movement of water far beneath the surface. |
Trade winds | Global winds between 0 and 30 degrees latitude. |
Westerlies | Global winds between 30 and 60 degrees latitude |
Coriolis effect | The curving of the path of a moving object from an otherwise straight path due to Earth's rotation. |
Gyre | A huge circle of moving ocean water above or below the equator. |
Sargasso Sea | A vast area of calm, warm water in the middle of the North Atlantic gyre. Named after Sargassum, a type of seaweed, that floats on the water. |
Antarctic circumpolar current | World's largest current, also called the west wind drift. Cold current; surface current. |
Equatorial countercurrent | Weak eastward-flowing current that runs in the opposite direction of the equatorial currents. Warm current; surface current. |
Gulf stream | Fast moving, surface current that flows up along the east coast of the U.S. |
North Atlantic current | Follows the gulf stream. Warm surface current. |
Antarctic bottom water | Cold, deep current. Slow moving. Moves northward along the bottom of the ocean from Antarctica. |