what exactly is an ocean tide? how does it work and why do we need it?

Answer 1

It's not that we really need it, but man has learnt to use the force of the tide for gaining electricity. On the other hand the tide can dangerously enforce the waves of a storm.
Responsible for the tide is the moon or, to be precise, the gravity of the moon, working together with the rotation of earth. The highest tide is always towards the moon, a tide a bit less high (caused mainly by the rotation) is on the opposite side of the earth, and in between there is low tide.
The moon influences not only the water, but a tiny little bit also the solid matter of our planet.

Answer 2

The ocean tide is the regular rise and fall of sea level in a certain area. It is caused by the earth's rotation and the gravity of the sun and moon, and it is affected by undersea geography. Most sea life (especially in the intertidal zone) has evolved for a certain level of salt water contact in a day; therefore these organisms make homes in an area that they get enough time in salt water, but not too much.
Why do WE need it? Hmmm...It probably can help sailors get out of shallow areas during high tide, or dry-dock their ships during low tide. Besides that, IDK.

Answer 3

It is the gravitational pull of the moon on the mass of the earth. The earth's gravitational force of course keeps everything on the surface, but the moon passes close enough to influence the movement of a large body of fluid. I can't say why we "need" it...I'm sure many creatures have evolved that depend on the rise and fall cycle of the ocean, it is possible for us to use it to produce electricity, and it keeps ocean life interesting.

Answer 4

its the moons gravity pulling on the water making it buldge on the side closest flatten on the sides facing outwards and the water on the opposite side pritty much stays the same making it bulge, i'm not sure why we need it i'm not sure if we need but i know with out the moon we'd be in a whole of alot of strife with massive waves and stuff.