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This is one of those questions that is easy to answer but quite difficult to explain without complicated formulae.

The easy answer is gravity.

Without being too technical gravity is the attraction that keeps you stuck to the earth and keeps the earth going around the sun.

Everything that has mass has this attraction to each other. So you gravitationally attract the earth to you too!

The are two basic rules and are quite simple.

The more mass there is, that is substance, then the more attraction there is.

The farther away it is then the less attraction there is.

There are formulae for this.

So you combine these two things an you can work out how much attraction a body can exert on another.

The moon has quite a lot of mass (substance) and is quite close to the earth, so it 'pulls'.

Because water is a liquid it can move more easily than a solid and so it 'bulges' upward toward the moon on one side of the earth because it is nearer and 'bulges' downward away from the moon on the other side of the earth because it is farther away. That's why we have two tides a day.

This is a very simple explanation and there are lots of physics and numbers involved.

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15y ago

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