<human>:  How does the moon cause tides?
<bot>: The moon's gravitational pull causes the tides by creating a bulge in the ocean, pushing the water toward the shore. This is known as the lunar tide, and it causes ocean levels to rise and fall twice a day. The gravitational pull of the moon also affects the Earth, creating a similar bulge in the Earth's crust which causes the solid land to also rise and fall twice a day.