Manypeoplehavewonderedwhatmakestheoceansriseandfallonth...
问题详情：Manypeoplehavewonderedwhatmakestheoceansriseandfallontheword’sbeachestwiceaday.ThosetidesarecausedbytheforceoftheMoon’sgravityandtherotation(自转)oftheEarth.Gravityactsonthecenterofanysolido...