Divemaster Final Exam A part 2 Questions And Answers 100% Verified

Divemaster Final Exam A part 2 Questions And Answers 100% Verified What is the ocean's major source of productivity and the base of the marine food chain? a. Krill b. Seagrass c. Coral d. Phytoplankton - answerd. Phytoplankton True or False. Natural processes, such as earthquakes and storms, are much more of a severe threat to coral reefs and wetlands than human-induced threats, such as pollution. - answerFalse. True or False. When an alien (invasive) species is introduced into an ecosystem, it may have no natural enemies, which allows it to quickly multiply and possibly overtake and kill off native species. - answerTrue. A _______________ exists when relatively warm, low-density surface water is separated from cool, high-density deep water. a. freshwater layer b. thermocline c. downwelling d. rip current - answerd. thermocline If you stand on a beach and watch water generally moving down the coast, pushed by waves approaching the shore at an angle and assisted by the prevailing wind, you are looking at a _______ current. a. rip b. tidal c. longshore d. upwelling - answerc. longshore A day after strong winds drive surface waters offshore, you notice that water conditions become clear and cool. This is likely due to: a. downwelling b. extreme tides. c. a longshore current. d. upwelling - answerd. upweling Gravitational interaction between the sun, moon and earth cause ______, while wind is the most common disturbing force that causes ___________. a. tides / waves b. surge / currents c. rip currents / ocean swells. d. waves / tides - answera. tides / waves. True or False. As a wave moves toward shore, its energy is affected by the bottom causing the wave height to rise, eventually becoming unstable and spilling its energy as surf. - answerTrue. Ways that you can encourage divers to protect the underwater world include: a. be a role model for others divers, dive carefully and be aware of equipment placement when diving. b. respect underwater cultural heritage and maritime history. c. report environmental disturbances or destruction and get involved in local environmental activities and issues. d. All of the above. - answerd. All of the above. While outside, at a very cold temperature, you fill a balloon with air. What will happen when you take the balloon inside and place it near a heater? a. The density in the balloon will remain unchanged. b. The volume of the balloon will decrease. c. The pressure in the balloon will increase. d. The volume of the balloon will increase. - answerd. The volume of the balloon will increase. Approximately how much denser is the air you breathe at depth of 30 metres/ 99 feet as compared to the surface?