<human>:  How does the moon affect the tides?
<bot>: The moon's gravitational pull is the main factor that affects the tides. It causes the oceans to bulge outward in two areas on opposite sides of the Earth, creating high tides. At the same time, the gravity of the moon pulls the water away from the shore on the opposite side of Earth, resulting in the low tides. As the Earth rotates and the moon orbits, there is a change in the height of the tides, giving rise to the twice-daily cycle of high and low tides.