SDI Open Water Scuba Diver Exam: Questions & Answers
Objects under water appear
(Ans- Closer and larger than they do on land
How much faster does sound travel in water, compared to air?
(Ans- 4 times
Water conducts heat away from your body
 (Ans- 25 times faster than air does
As you descend
 (Ans- colors fade, reds and oranges fade first, 30 meters seem blue and gray
water temp does your body need thermal protection
 (Ans- 86 degrees
What does SCUBA mean
 (Ans- self-contained underwater breathing apparatus
When water stratifies itself into layers, according to temperature, the boundary between layers is known as a(n):
1: Halocline.
2: Ichtyocline.
3: thermodin.
4: Thermocline.
(Ans- Thermocline