DM Chapter 8 Awareness of the Dive Environment

Question 1

Why is it important to be knowledgeable about the biological and physical properties of the aquatic realm?

Answer 1

1. Satisfy diver curiosity.
2. Plan dives according to the environmental conditions.
3. Make divers aware of particularly fragile organisms.

Question 2

Why is diving in an environmentally responsible manner important?

Answer 2

1. Role model
2. Credibility as ambassadors for the aquatic realm
3. Reduces the effects on the environment while diving

Question 3

What is the percent water covers the Earth’s surface?

Answer 3

71 %

Seawater is 97%
Fresh is 3 % (3/4 is frozen in polar ice caps)

Question 4

What are the two ways all the water on Earth connect?

Answer 4

1. All the seas connect physically around the bottoms of the southern continents, as well as under the Artic ice cap.
2. The hydrological cycle.

Question 5

What are the 2 resources the ocean produces that are vital to life?

Answer 5

1. Oxygen
2. Heat distribution

Question 6

(Blank) form the base of the food chain

Answer 6

Primary producers

Question 7

Why are coral reefs important?

Answer 7

1. Nursery for approximately 25% of all known marine species.
2. Protects island and coastal communities.
3. Most diverse ecosystem on Earth

Question 8

What are 3 important judgement considerations when current diving?

Answer 8

1. Knowing whether to cancel the dive.
2. Replan as a drift dive.
3. Find a different dive site.

Question 9

Four forces that cause currents.

Answer 9

1. Wind
2. Waves
3. Earth’s rotation
4. Tides

Question 10

What are two causes of upwelling?

Answer 10

1. Wind
2. Deep currents deflecting upward

Question 11

What is the primary disturbing force that causes waves?

Answer 11

Wind

Question 12

A wave breaks when the depth is (blank) its height.

Answer 12

1.3