Slack tide or 'the still of the tides' is when there is no movement in the tidal streams; it is neither ebbing or flooding. This can be a great time to dive as there is less water movement.

Hight tides are seen as preferable as they can make entries and exits simpler from shore and bring upwellings of clearer water. Perfect for budding photographers.

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If a 'Fal-safe' regulator were to malfunction it would always do so in an open position. This means it will always give a continuous flow of air rather than cutting off the supply.

This is the reason we practice the Freeflow Regulator skill in the PADI Open Water Diver program.

Blood is made up of Plasma, Red Blood Cells, White Blood Cells and Plasma. Plasma is responsible for the clotting process. 

Low platelet count is called thrombocytopenia.

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The rate in which a tissue compartment loads and unloads gas is called a half-time; the amount of time it takes the remaining space within the theoretical compartment to fill/empty - e.g. from 0% to 50% and then from 50% to 75% etc.

There are 6 half-times in every compartment before it is considered saturated or desaturated.

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We have all the information we need to answer this one with ease. It tells us how much downward force the anchor has - 22 Kgs and how much upward force the displacement is causing - 18 litres, and which type of water the anchor lying in.

Since it's asking for an answer to be expressed as volume we must convert the weight from Kgs to litres, since this is seawater that will be 22/1.03 - the weight of the object divided by the weight of the water. That equals 21.36 litres.

That represents the total volume required to lift the anchor. Since I already have 18litres of displacement already assisting this, I have to subtract that from the total amount. 22.36-18=3.36 litres.

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