Notes

"Table salt is made up of the chemical sodium chloride. The salt in ocean water is mostly sodium chloride, too. However, the salt in the oceans has other kinds of salt in it too. The main other chemicals in sea salt are magnesium, sulfate, calcium, and potassium." "The next step is to divide the volume of the ocean by the rate at which the water would flow down the plug hole. That gives us a final answer of over 80 trillion years. Or, to put it another way, almost 6000 times longer than the entire Universe has been in existence." "Waves are most commonly caused by wind. Wind-driven waves, or surface waves, are created by the friction between wind and surface water. As wind blows across the surface of the ocean or a lake, the continual disturbance creates a wave crest. The gravitational pull of the sun and moon on the earth also causes waves. 'In water, absorption is strong in the red and weak in the blue, thus red light is absorbed quickly in the ocean leaving blue. Almost all sunlight that enters the ocean is absorbed, except very close to the coast. The red, yellow, and green wavelengths of sunlight are absorbed by water molecules in the ocean."