All gases want to reach a stable state of equilibrium. If a component is added to disrupt this, such as a higher concentration of oxygen, the gases will react to reach equilibrium once more on the side of the reactant and the concentration will decrease until equilibrium is found again in favour of the oxygen.

This accelerates the off-gassing of the inert gas; nitrogen and may be used as first aid in cases of DCS and as a way to safely accelerate decompression in trained Technical Divers. 

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Suspended particles in the water, called turbidity, may be there from several sources such as runoff, silt etc. 

This turbidity causes the scattering of light which may cause the phenomenon of visual reversal where the object may appear more distance than they actually are.

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The cycle begins with evaporation from the ocean's surface where water vapor evaporated, rises and condenses into clouds. 

They then redistribute this water vapor around the Earth as precipitation or rain. This water then either becomes groundwater or makes it's way back to the oceans.

This cycle is essential to all life on Earth and unfortunately, poisoning of the water in this cycle is threatening tit's ability to sustain us in the future. 

The linking Curses heading located in the Paperwork and Administrative Procedures of your PADI Instructor Manual covers this.

A PADI Specialty Instructor certified to teach specific courses, such as Altitude Diver and Dry Suit Diver are able to integrate the knowledge development and performance requirements with the PADI Open Water Diver Course and run the two programs concurrently.

There is a limit placed on the conduct of these programs to avoid task loading the students and that is that only one PADI Specialty Diver Course from the list contained in the Linking Course section, when may be taught by PADI Specialty Instructor for the program, may be conducted concurrently with the PADI Open Water Diver Course.

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Environmental seals on the regulator's first stage can stop contaminants such as sand or sediment entering the regulator. It may also be used to prevent components from freezing up in colder water temperatures.

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