Manypeoplehavewonderedwhatmakestheoceansriseandfallonth...
問題詳情：Manypeoplehavewonderedwhatmakestheoceansriseandfallontheword’sbeachestwiceaday.ThosetidesarecausedbytheforceoftheMoon’sgravityandtherotation(自轉)oftheEarth.Gravityactsonthecenterofanysolido...