What does SCUBA stand for?
~~> Self
Contained
Underwater
Breathing
Apparatus
List the three important scuba diving changes that occurred in the 1950s
~~> 1) Dive tables published for repetitive dives
2) Improved design/quality of scuba gear
3) Dive computers commercially av...
How much larger and closer do objects appear under water and why?
✓ ~~> 33% larger, 25% closer
Light bends in the air-space between the lens and your eyes.
How much faster does sound move through water than air and why?
✓ ~~> 4 times faster in water
Water is 800x denser than air; sound travels through denser mediums at faster
rates
What is the first color absorbed underwater?
✓ ~~> RED (followed by OYGBIV)
When diving from shore, the best time to dive is when there is the least
amount of tidal current. _____ tide is when there is no horizontal water
movement.
✓ ~~> Slack
If you are caught in a rip current, first swim _____ to the current to get out of it
before swimming towards shore.
✓ ~~> Perpendicular
Start your dive by swimming ____ the current
Master01 | September, 2024/2025 | Latest update
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