You don't sink into the Earth because, in most places, the Earth's surface is stron enough to support your weight. You would sink if you were on quicksand, the tar in a tar pit, or in water, as examples.
when regions of earth surface sink down
NO!
The rain does technically sink , but 75% of the world is water.
Correct.
Rain sinks into the surface of the Earth where it can. There is no bottom or top to the Earth since it continuously spins on its axis.
when regions of earth surface sink down
Into what exactly would you expect it to sink?
NO!
sink holes are destuctive because it is breaking down the earth surface
The rain does technically sink , but 75% of the world is water.
the rain does not sink down to the centre of earth because it the centre of earth and nothing could be sink down to the centre
Correct.
From dirt water
float
oceans
the earth
The dead sea. The level of salt is so high that it will make it very hard to sink.