Ssi Owd Chapter 5

Front 1

The surface of the Earth is actually made up of very little earth. It is, in fact, about _____ water

Back 1

72%

Front 2

It is estimated that plant production in the oceans may be _____ times more than that on land. More than _____ of the oxygen is produced by marine plants. Even the photosynthesis that takes place on land requires water which originates in the oceans.

Back 2

10, 85%

Front 3

For us as divers, the oceans may be playgrounds, but playgrounds are only fun and exciting if we keep them _____ and well _____.

Back 3

clean, maintained

Front 4

The force that originally acts on the water to create tides is the gravity of the _____ and _____, primarily the _____, pulling at the side of the earth nearest the moon.

Back 4

moon, sun, moon

Front 5

Near shore, the best time for diving would probably be during periods of _____ exchange of _____ between the tides.

Back 5

minimal, water

Front 6

Because dense, cold water tends to sink underneath warm water, layers of various temperatures are found at different depths. The boundaries between these layers are called the _____.

Back 6

thermoclines

Front 7

You should keep in mind when freshwater diving that the temperature at the _____ may be much warmer than the temperature at your _____ _____.

Back 7

destination depth

Front 8

The _____ and harder the wind blows, the _____ the waves become. The longer the fetch, the further the wave action will be extended

Back 8

longer, larger

Front 9

It is imprtant to hold on when entering the boat because while your _____ feels weightless in the water, as soon as you emerge from the water it will weigh you down and you may instantaneously feel the full weight of your body and equipment transferred to your _____.

Back 9

equipment, arms

Front 10

Take these precautions in case you accidentally slip back into the water: Keep your mask in place so that you can _____, your regulator or snorkel in place so you can _____, and your BC inflated so you can _____.

Back 10

see, breathe, float

Front 11

When entering or exiting from shore, the diver's primary concern is to avoid being knocked down and buffetted by _____ and _____.

Back 11

surge, backwash

Front 12

Anytime the waves reach the shoreline, the water must return to the sea. The returning water creates a back current or _____ _____.

Back 12

rip current

Front 13

Any time you do find yourself facing into a rip current, turn and swim at a _____ _____ or _____ to it until you catch a shorward water movement, or at least move out of the main force of the current.

Back 13

right angle, diagonal

Front 14

In _____ _____ you simply float along with the current, and so does the boat. When you surface, the boat picks you up.

Back 14

drift diving

Front 15

Many dive sites throughtout the world are considered _____ _____ and are protected by law. This protection helps keep these dive sites in pristine condition by _____ the coral and other aquatic marine life from hunters and collectors.

Back 15

marine parks, protecting

Front 16

Sea stars, brittle stars, sea urchins, sand dollars, and sea cucumbers all belong to the group of animals known as the _____.

Back 16

echinoderms

Front 17

The _____, fishes and mammals, are well known and are the most visible life forms in the open waters.

Back 17

vertabrates

Front 18

The creatures capable of inflicting injury will do so only _____. They will react when surprised by being _____ or having their territory invaded, or when taunted or molested.

Back 18

defensively, touched

Front 19

There is no doube that some sharks are _____ and can be dangerous - but almost exclusively when provoked.

Back 19

unpredictable

Front 20

Depending on the area of the world where you are diving, your are likely to fun into one of a number of fish belonging to a few _____ _____, including bass, pike, perch, catfish, trout, carp, crappie, and gar.

Back 20

freshwater families