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| Sound travels _ times faster in water then in air. |
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| Water takes heat _ times faster then air. |
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| The weight of air at the surface is _ PSI. |
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| The normal ascent rate is _ feet per minute. |
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| The normal descent rate is _ feet per minute. |
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| Should you hold your breath? |
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| Altitude diving starts at _ feet above sea level |
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| Water adds an additional _ psi for every _ feet of water. |
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| Air is made up of _% oxygen and _% nitrogen. |
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| The refraction of light in water when diving causes objects underwater to look _% larger and _% closer. |
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| The maximum depth for recreational diving is _ feet |
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| No one should fly _ hours after any diving. |
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| Divers must stay within _ feet of flag, and boats must stay _ feet away from the flag. |
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| The first aid for stings is. |
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| Is the salinity of the ocean the same throughout the world? |
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| Back and forth movement of water caused by waves. |
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