Two Layer Ocean Pretest
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- Oswin Boone
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1 Two Layer Ocean Pretest Shawn Doan Sehome High School, Bellingham, Washington Q1. Plants don t grow at the bottom of the ocean, because? a. There are no ocean plants b. There is no fertilizer at the bottom of the ocean c. There is no light at the bottom of the ocean d. It is too cold at the bottom of the ocean e. Incorrect statement plants do grow at the bottom of the ocean Q2. Tropical ocean water is warm all the way to the bottom of the ocean, because? a. It is closer to the sun than arctic ocean water b. It receives more light than arctic ocean water c. Hydrothermal vents (hot springs) at the mid-ocean ridges heat up the water d. The bottom water is formed in the tropics e. Incorrect statement bottom water in the tropics is cold Q3. Deeper water is warmer than shallow water, because? a. The greater pressure increases the temperature b. Hydrothermal vents (hot springs) at the mid-ocean ridges heat up the water c. Incorrect statement deep water is colder than the shallow water Q4. Does water pressure change with depth? a. No, water pressure is the same all the way to the bottom b. Yes, there is less pressure at the bottom c. Yes, if you are twice as deep you experience twice the pressure d. Yes, if you are twice as deep you experience 4 times the pressure
2 Q5. Deep ocean fish have big eyes, because? a. There is very little light in the deep ocean b. Big eyes withstand pressure better c. Big eyes withstand cold better d. Larger fish have bigger eyes Q6. Salinity at the surface of the open ocean might be greater in the tropics, because? a. Evaporation of water molecules b. Rivers flowing into the ocean c. Addition of salt molecules d. More sun Q7. Surface ocean water is than deep ocean water a. Warmer b. Colder c. The same temperature
3 Questions 8-12 refer to the graph above. Q8. Which of the following decreases quickly with depth then stays relatively constant? a. Pressure b. Salinity c. Temperature d. Oxygen
4 Q9. Which of the following increases linearly with depth? a. Pressure b. Salinity c. Temperature d. Oxygen Q10. What would cause the oxygen to decrease with depth in the first 600 meters? a. Respiration of sinking algae by bacteria b. The abundance of mesopelagic fish and squid c. 600 meters is closer to the source of oxygen in the ocean Q11. The ocean has been described as having 2 layers. Based on the data in the graph where does the ocean change from one layer to another? a. Surface b. 300 meters c. 600 meters d meters Q12. Based on the data in the graph how deep would you estimate that light penetrates the ocean? a meters b meters c meters d. 300 meters e. 10 meters End graph questions
5 Q13. Surface water contains plants than deep ocean water a. More b. Less c. About the same number of plants are found at the surface as at depth Q14. Deep water forms? a. Near the tropics b. Near the equator c. Near the poles d. Deep water cannot be distinguished from any other water Q15. Dissolved oxygen in the ocean? a. Increases with depth because deep water is colder b. Decreases with depth because there is more respiration in deep water than in shallow c. Is greater in the tropics because warm water dissolves more oxygen than cold water d. Is great near continents than the open ocean Q16. What is the major difference in the 2 layers of the ocean? a. The amount of light b. The amount of oxygen c. The pressure d. The temperature
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