The oceans change all the time. The tide rises up onto the beach which we call a high tide and then recedes back into the ocean which we call a low tide. This all seems to happen without any help from somewhere but it is the moon that controls this phenomenon.

How does this all happen ? Letís have a look.

When the Sun, Earth and moon line up in a straight line, the combined gravity of the Sun and the moon have an effect on the earthís oceans, causing them to rise by as much as 15 meters. These very high and low tides are called Spring tides and happen every two weeks.

When the Sun, Earth and moon are perpendicular to each other, their gravitational pulls cancel each other out resulting in weak high and low tides. These tides are called Neap tides.

Ocean Tides

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