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THIS IS REALLY COOL THOUGH WE COVERED THIS IN ASTRONOMY
There’s this thing called tidal bulges, which are an effect of gravity. The Earth has the tidal bulge, and it’s a little like an oval shape. The moon pulls on it and that’s also why we have tides! On one side of the earth, it drags the water towards the move, and on the other, the water isn’t quite affected by the gravity, but the Earth itself is, so it’s also pulled, which makes high tide on both sides!
The bulge also affects the moon’s gravity, though, which is why it’s moving away from Earth! The bulge creates a “push” effect on the moon, which is relatively small, but enough to change the moon’s orbit into a spiral shape.
Did you know that when dinosaurs were around, there were about 200 foot tides?