In lakes and ponds, the same forces are at work, but in miniature. How much tides range depends partly on the size, depth and slope of the water’s basin. On seacoasts, where the basin stretches halfway across the globe, tides range about 6 to 10 feet. Compare that to Lake Michigan, where tides range just a few inches! Smaller lakes and ponds also register the effect to lesser degrees, in most cases imperceptibly. Even when we can’t see it, the whole earth responds to the gravitational pulls of the sun and moon.
It is impossible to switch off the effects of the gravitational pull of the moon and the sun. The sun's tidal effect is only 46 percent as strong as the moon's.
Lakes, even the largest ones like Superior, do not have tides because the gravitational pull of the moon raises these bodies along with the land that is underneath them and surrounds them. The solid Earth swells a maximum of about eighteen inches under the moon's tidal pull, but the effect is imperceptible because we have nothing that is not also moving by which to gauge the uplift.
The oceans, on the other hand, are massive. When the moon pulls on the Atlantic or Pacific the results are clear to see as ocean water moves away and back to the coastal areas.
Return to FunTrivia
"Ask FunTrivia" strives to offer the best answers possible to trivia questions. We ask our submitters to thoroughly research questions and provide sources where possible. Feel free to post corrections or additions. This is server B184.