Tides
There are 2 cycles of high and low tides every 24 hours
The Moon’s gravity pulls the Earth’s oceans and seas toward it, created a bulge
A bulge is created on the opposite side because the Moon pulls the Earth toward it
The tides occur as the Earth rotates on its axis
Spring tides occur when the Sun and Moon are lined up and the force their gravity together causes high and low tides to be exaggerated
Neap tides occur when the Sun and Moon are perpendicular to each other (at ninety degrees to the Earth) and the forces are cancelled out, causing not much difference between high and low tide
Spring tides occur during full and new moons