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| The surface of this planet is actually made up of very little earth. It is in fact about --- water. |
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| It is estimated that plant production in the oceans may be --- times more than on land. More than --- of oxygen is produced by marine plants. Even the photosynthesis that takes place on land requires water, which originates in the ocean |
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| For us as divers, the oceans may be playgrounds, but playgrounds are only fun and exciting if we keep them --- and well --- |
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| The force that originally acts on the water to create tide is the gravity of the --- and ---, primarily the ---, pulling at the side of the earth nearest the moon. |
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| Near shore, the best time for diving would probably be during periods of --- exchange of --- between the tides. |
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| Because dense, cold water tends to sink underneath warm water, layer of various temperatures are found at different depths. The boundaries between these layers are called --- |
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| You should keep in mind when freshwater diving that the temperatures are found at the --- may be much warmer than the temperature at your --- --- |
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| The --- and harder the wind blows, the --- the waves will become. The longer the fetch, the further the wave action will be extended |
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| It is important 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 arms |
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| Take these precautions in case you accidently slip back into the water: Keep your mask in place so you can ---, your regulator or snorkel in place so you can ---, and your BC inflated so you can ---. |
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| When entering or exiting from shore, the diver's primary concern is to avoid being knocked down and buffeted by --- and --- |
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| Any time waves reach shoreline, the water must return to sea. This returning water creates a back current, or --- --- |
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| Any time you do find yourself facing into a rip current, turn and swim at a --- --- or --- to it until you catch a shoreward water movement, or at least move out of the main force of the current. |
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| In --- --- you simply float along with the current, and so does the boat. When you surface, the boat picks you up. |
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| Many dive sites throughout the world are considered --- --- are 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. |
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| Sea stars, brittle stars, sea urchins, sand dollars, and sea cucumbers all belong to the group of animals known as the --- |
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| The ---, fishes and mammals, are well known and are the most visible life forms in the open waters. |
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| 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. |
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| There is no doubt that some sharks are --- and can be dangerous; but almost exclusively when provoked |
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| Depending on the area of the world where you are diving, you are likely to run into one of a number of fish belonging to a few --- ---, including: Bass, Pike, Perch, Catfish, Trout, Carp, Crappie, and Gar. |
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