the moon moves away from earth & moving away from the source increases the distance ->  the moon moving away from earth increases the distance between the moon and the earth  the moon moving away from earth increases the distance between the moon and the earth & as the distance from an object increases , the force of gravity on that object will decrease ->  the moon moving away from earth causes the force of gravity of moon on earth decreases  the moon moving away from earth causes the force of gravity of moon on earth decreases & as the gravitational pull of the moon decreases , the height of ocean tides will decrease -> the moon moving away from earth causes the height of ocean tides on earth to decrease