The water on Earth will increase and decrease over day and night. When the water is high, it's called an high tide and when the water is low, it's called a low tide. Everyday, we experience 2 high tides and 2 low tides. There are always two parts on Earth is a low tide and two parts on Earth that has high tides. 

Tides are caused by the Moon's gravity and the Sun's gravity pulling the water up. The side with the moon present will get high tides as well as the opposite side of the Earth. This is because there is no force of gravity pulling on that side. The sides have gravity being pulled from the side, causing the water to go really low.

There are also two different sessions of tides. One is the spring tides and the other is the neep tides. During spring tides, the Moon, Earth, and Sun are lined up. The sun's gravity and the moon's gravity are pulling at the same side on Earth. This causes lots of water to rise from that side and alot of water going away from the sides. There is no force on the other side and it is free to just go as much as it likes. The Earth, Moon, and Sun can be in any order. So instead of Earth, Moon, and Sun; it could be in an order of Moon, Earth, and then Sun. There is a big difference of water between the high tides and the low tides during spring tides.

Neep tides are when the Earth, Moon, and Sun are perpendicular - a 90 angle. This causes water to be pulled from both parts of the Earth. Since the moon is always closer, it has the stronger pull on Earth and causes the high tides. The difference between the high tides and the lower tides aren't much different from each other. The moon can be anywhere near the Earth as long as it's in a 90 angle to keep it a neep tide.

The Moon can also be behind the Earth in a full moon phase.

General Information : Days and Nights : Years : Seasons : Moon Phases : Eclipses : Tides : Credits

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Timothy Phan