Show Cause of Ocean Tide v Tides are caused by tho gravitational gravita-tional attraction or pull of the sun and moon upon the water and upon tho earth Itself The moon being so much nearer than the sun Is of course tho principal cause When tho moon Is directly over a given place it pulls tho water under It and thus tends to keep lip a tidal wave just under the moon At tho samo i i time It Is pulling the earth Itself but It pulls the water more than the earth underneath simply because tho moon Is nearer to the water on tho surface than It Is to tho solid earth behind It |