Los Angeles Valley College Section 12249 3 units, Winter, 2018 George Leddy, Ph.

Question

Los Angeles Valley College Section 12249 3 units, Winter, 2018 George Leddy, Ph.D., instructor Quiz 8 Coastal aquifer withdrawals can a cause a drop in the water table b allow salt water to intrude and contaminate freshwater 16 Downwelling is important because it a. brings nutrients to the surface b. keeps pollutants low c. provides an influx of oxygen for deep-water life d. transports fish e. provides a current for conductive heat in the land d e produce sinkholes in sandy soils (all of the above) 12. Which of the following is NOT true for salinity in the ocean? 17 Layers develop in the ocean due to sunlight penetration. The a. b, c. d. e. varies from place to place due to evaporation and runoff ranges from 3.3 to 3 7% there is higher than average salinity at the equator gives the ocean its salty flavor there is higher than average salinity in areas that are adjacent to deserts uppermost layer is called the photic layer True or False? 18 Currently, the greatest dilemma facing marine systems is a. pollution b. plastic soda can rings c. overharvesting d. abandoned fishing nets e. oil 13 Horizontal movement of ocean water results in b. high heat capacity c. salinity d currents e spatial segregation among layers 19 By-catch in the shrimping industry refers to marine life that a. is captured by gear designed to catch other fish cgreater in d. typical of catches in the tropics e. all of the above to the shrimp brought on board The areas that underlie the shallow waters bordering the continents are the 14 a. continental shelves b. pycnoclinic shelves 20 -_ % of the weight of marine catches is fed to animals shelves d. bathymetric shelves e. surface shelves The areas where rivers flow into oceans are called a. mangrove forests b. salt marshes c estuanies d the Everglades 15. 21. Nearly all marine protected areas a. prohibit fishing b. are harvested by multiple means c. are protected from pollution by physical barriers d. are protected from changes in e. none of the above Page 2 of 2 Answer all questions. Use Scantron@ two sided 100 question cards (882). Make clear and neat marks. Be nx mark completely or use another card. DO NOT ALLOW OTHERS TO SEE YOUR ANSWERS

Explanation / Answer

11. - e

Explanation:- The aquifers near the coast is called coastal aquifer. They are usually very important to the local civilization. The dangers of using a coastal aquifer is that when you get to them, they are in balance with the salt water. If you pump the freshwater low, the salt water will intrude and contaminate the aquifer. When too much water is taken from the aquifer inland lowering the water table it allows for the influx of salt water thereby ruining the aquifer for use for sometime.

12. - b

The sailinity is the amount of salt dissolved in ocean water. The sailinity of the ocean varies from place to place, especially at the surface. Much of the ocean has sailinity between 34ppt to 36ppt, but there are places tend to be higher or lower.

13. - c

The horizontal movements are due to variation in density from one part to another, which results from the differences in the sailinity & temperatures.

14. - a

The area that underlies the shallow water bordering continent is called the continental shelf.

15. - c

An estuary is typically the tidal mouth of a river, where fresh & salt water mix.

16. - e

Downwelling is important for deep-sea creatures because it helps regulate the temperature of the oceans.

17. - True.

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