SDI Chapter One: The Underwater Enviroment Questions And Answers Graded A+
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Course
DI Chapter One: The Underwater Enviroment
Institution
DI Chapter One: The Underwater Enviroment
Name three How much larger and closer do objects appear underwater and why? -
️️Water is denser than air, objects underwater appear closer than they actually are
(25 percent closer). Objects also appear one third larger than they actually are.
different devices that modern dive computers rep...
Name three How much larger and closer do objects appear underwater and why? -
✔️✔️Water is denser than air, objects underwater appear closer than they actually are
(25 percent closer). Objects also appear one third larger than they actually are.
different devices that modern dive computers replace. - ✔️✔️Modern dive computers
replace the need for dive tables, gauges, and different alarms (audible and/or visual).
What does "SCUBA" stand for in scuba diving? - ✔️✔️It stands for self-contained
underwater breathing apparatus.
List the three most important scuba diving changes that occurred in the 1950s. -
✔️✔️The three most important changes were dive tables, personal dive computers
(PDC), and enhanced diving equipment.
What sets Scuba Diving International apart from other training agencies? - ✔️✔️SDI
was the first diving agency to provide entry-level instruction and incorporates the use of
dive computers.
How much faster does sound move through water than air and why? - ✔️✔️Sound
moves four times faster in the water than it does on land because water is about 800
times denser than air.
What is the first color to be absorbed underwater? - ✔️✔️Red is the first color to
disappear under water.
Waves are usually caused by _________? - ✔️✔️Wind
True or False? Anticipate surge action to avoid contact with stationary objects. -
✔️✔️True
What types of marine life cause most diving injuries? - ✔️✔️Fire coral, jellyfish, and
venomous fish on the sea floor cause the most diving injuries.
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