'I am NOT an alcoholic': Gerard Butler reveals the real reason behind his stretch in rehab. Actor Gerard Butler has revealed his rehab agony and set the record straight over rumours of his alcoholism. The 42-year-old Scot checked into the Betty Ford Centre in February for three weeks after being injured in a surfing accident. He said: 'Maybe a stronger person wouldn't have needed to go. But I'm glad I did it.
Gravity is one major force that creates tides. In 1687, Sir Isaac Newton explained that ocean tides result from the gravitational attraction of the sun and moon on the oceans of the earth (Sumich, J.L., 1996).
Around the UK, there are mostly two high tides and two low tides each day: this is called a semi-diurnal regime. Other parts of the world have a diurnal tidal regime with only one high tide and one low tide each day. The difference in height between high tide and low tide is called the tidal range.round the UK, there are mostly two high tides and two low tides each day: this is called a semi-diurnal regime. Other parts of the world have a diurnal tidal regime with only one high tide and one low tide each day. The difference in height between high tide and low tide is called the tidal range.