Explain how the positions of earth, moon and sun affect the tides

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The position of the earth ,moon and sun affects the tides in the following ways :when the sun ,moon and earth fall in a straight line the solar tide has an additive effect  on the lunar tide leading to extra high tides and very low tides ( spring tides) When the sun and the  moon are at right to each other ,the solar tides partially cancels out the lunar tide and produces neap tide.

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