Question: Why does the moon control the tide?

Kevin Honeychurch answered on 23 Jun 2015:

The gravitation pull between the moon and the earth causes a “buldge” of water on the side of the earth facing the moon and the side opposite. The buldge or build-up of water moves as the moon orbits the earth approximately once per day. This causes approximately two buldges (high tide / low tide) per day. By the way, the Sun’s gravity also affects the tides causing the height of the tide to gradually change so that we get ‘spring’ high and low tide.
Have look for what happens with the Severn Bore……………