Oceans+1+review


 * Honors Earth Science Objectives   Water World**
 * Please enter your answers using only your first name or user name!**

**//Purple has been checked as correct.//** These next questions are about the graph below: What is the name of the zone of the ocean at A?     Surface zone DaLisha What is the name of the place where salinity rapidly changes (B). Hint: not a zone. Pycnoclne DaLisha Is salinity at the surface higher or lower than in the deep zone? What could account for why this would happen? Lower, because as the water is being heated up by the sun, more salt is being dissolved into the water. And since the deep zone is colder than the surface zone, salt isn't dissolved as quickly or easley. DaLisha Now try this graph: What is the depth of the thermocline? What is the name of the zone labeled A? What about zone B? A is the deep zone and B is the transition zone. DaLisha Where on Earth must this profiler be located?

They are salty because of the volcanic eruptions at the bottom of ocean floor and the runoff of rivers, and surface water. - Olga
 * 1. Why are the oceans salty?

2. Why don’t the oceans get saltier over time? because material is being moved as rapidly as its being added -amanda **  **The reason for this is because while salts are being removed from the ocean salts are also being added in ways such as under water volcanic eruptions and erosion, the salt is taken out in processes such as freezing **  **  -Julian- ** **//  Amanda – give some examples of how this happens  //**

** 3. Outline the sources (2) and sinks (3) of ocean salts. Sources.- from the run off of rivers and surface water.- underwater volcanic eruptions. ** Evaporation and freezing increases salinity of ocean water. – Olga ** **Mrs. Herrold dont evaporation and freezing decrease the salinity of ocean water and volcanic eruptions and erosion increase it? ** **-Julian-  ** ** 4B. What factors decrease it? -increased biological activity, -precipitation, -melting, and continental margins (edges)/runoff - **** ALL **** take out the salinity of ocean water. – Olga ** ** 5. What is the thermocline? Why does it exist? the layer of ocean water in which there a rapid change of temperature that occurs with the depth. it exists because the sun cannot reach all the way through the ocean to warm it -amanda ** **  6. Why isn’t there a thermocline in polar areas? Because the water is always the same temperature at all levels of depth; there's no direct sun. -Olga **
 * Sinks.-minerals precipitate when the water is too concentrated.-rocks form, like Limestone (limestone also prevents global warming b.c it collects CO2.) -biological processes (shells) - Olga **
 * 4. What factors increase the salinity of ocean water?

** 8. What is the pycnocline? Why does it exist? rapid change in water density with depth. it exists because of the thermocline (because density is directly related to temperature) **  9. Why isn’t there a pycnocline in polar areas? Because the density is always the same with depth.- Olga ** 10. What are the 3 layers of the ocean, from surface to floor? the surface mixed zone, then goes the thermocline/pycnocline, and the bottom which is the deep zone. – Olga ** transition zone. -elizabeth ^^
 * // The area of the thermocline or pycnocline has a special name – what is it? (a type of zone)  //**

** 11. What 3 factors cause surface mixing in the ocean? waves, turbulence from currents and tides, ** the sun waves, turbulence form currents and tides, and wind waves DaLisha
 * // Who did this one? Correct- except NOT the sun part!  //**

12. How do pressure, salinity and temperature affect the rate that gas dissolves in the ocean? They increase the speed that it happens  -Julian Quinlan-

** 13. Explain the ocean’s role as a carbon dioxide sink. (3 main types of sinks) the CO2 decreases in atmosphere because of the ocean. There are 3 main types of sinks, limestone, plants meaning; algae and plankton, and the coral reefs. - Olga  **