MrSnuggles
"The moon will therefore exert some gravitational force on that part of earth that is closest to it. Since land does not move that easily, water is the main reason we notice this mutual force between out space home and its moon. The water is "attracted" to the force and moves in the direction of the moon which causes tidal flows. "
Don't forget the increase in centripetal action on the far side of the earth moon pair due to the increase in radius of orbit around the centre of earth mass that acts to reduce gravity causing the other "lump" of water.