Why does earth not flood towards the moon or a nearby planet
Answers
The gravitational attraction between the Earth and the moon is strongest on the side of the Earth that happens to be facing the moon, simply because it is closer. This attraction causes the water on this “near side” of Earth to be pulled toward the moon. As gravitational force acts to draw the water closer to the moon, inertia attempts to keep the water in place. But the gravitational force exceeds it and the water is pulled toward the moon, causing a “bulge” of water on the near side toward the moon
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Answer:
The Moon has been vital for life in Earth due to stabilising its rotation and protecting it from celestial impact. If we had never had a moon, flooding would be the least of our worries.
The Moon is currently migrating away from us at a rate of 4cm per year so we will maintain hold of it for a long time.
However, the Quantum Theory (and String Theory - which aims to unify it with relativity) allows for particles to experience a sudden energy change and, almost randomly, disappear and reappear once back on our hyper-plane elsewhere in the universe. These events are thought to be constantly occurring on smaller scales (a Quantum Particle is 10^-34M) but the probability of it happening on larger scales correlates with every single particle in an object suddenly changing energy state and 'teleporting' elsewhere - which is almost nil.
Ignoring that, if it did happen and the moon disappeared, the tides would initially remain stable with areas at high tide and low tide or somewhere inbetween depending on positioning. Liquid seeks the path of lowest resistance so would eventually flow to more even levels worldwide according to gravitational pull. This would flood the poles where sea levels are much lower partially due to less lunar influence (other reasons include liquid trapped in ice caps and lower gravitational force). Antarctica is high above sea levels so would be less affected.
Tides would continue on the influence of the Sun but would be much less pronounced. Global sea levels would rise due to ice melting after water covering it. Ice on higher altitudes and floating ice may survive due to water failing to get high enough or it rising with the sea (density). Due to water being less concentrated around the equator, sea levels would fall in that region.
Earth's rotation would become unstable which could produce dire consequences for life on Earth.
Earth's shape may also change so the diameter becomes more even around the equator compared to the poles. This is due to less gravitational pull being exerted on equatorial regions.
https://www.quora.com/Would-the-Earth-flood-without-the-moon