SDI scuba training chapter 1 latest update graded A

SDI scuba training chapter 1 latest update graded A What does scuba stand for? self contained underwater breathing apparatus List the 3 important scuba diving changes that occurred in the 1950s. dive tables, pdc [personal dive computer], enhanced diving equipment Name 3 different devices that modern dive computers replace. dive tables, gauges, audible and/or visual alarms What sets scuba diving international apart from other training agencies? sdi understands the need for enhanced diving equipment How much larger and closer do objects appear underwater and why? 25%, in order for your retinas to stay focused underwater there needs to be an airspace between your eyes and the water How much faster does sound move through water than air and why? 4 times faster. water is about 800 times denser than air. What is the first color to be absorbed in water? red When diving from a shore, the best time to dive is when there is the least amount of tidal current. BLANK tide is when there is no horizontal water movement. BLANK=slack If you are caught in a rip current, first swim BLANK to the current to get out of it before swimming towards shore. BLANK=parallel Waves are usually caused by BLANK. BLANK=wind Anticipate surge action to avoid contact with stationary objects. TRUE or FALSE? TRUE What types of marine life cause most diving injuries? fire coral, jellyfish, fish on the sea floor. What should you do if you see a potentially dangerous animal on the sea floor and it does not leave the area? avoid toughing sea life, and always respect the environment List 3 different reasons that it is advisable to check with your local dive center before conducting a dive in an area you are unfamiliar with? knowing the rule policy, expectation of what you will encounter, and what first aid to bring