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Ocean

how salty is the ocean
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How Salty Is the Ocean?

How Salty Is the Ocean? In general, the salinity (saltiness) of the ocean is 3.5 percent by volume. A gallon of seawater contains about a qu

why does the ocean look blue
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Why Does the Ocean Look Blue?

Why Does the Ocean Look Blue? The ocean usually appears to be blue. However, sea water, as anyone knows who has splashed about in the surf,

what causes ocean tides
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What Causes Ocean Tides?

What Causes Ocean Tides? Tides are the rise and fall of the levels of the ocean. They are caused by the gravitational pull of the Sun and Mo