If the world somehow enters the black hole, what will happen to the world and everything in it (humans, animals, trees, buildings etc)?
1. What is black hole really?
Black Hole is a place in the universe where gravity is so high,
Even the light can't come out.
That is, anything — light, gas, planets, even stars — pulls on a “one-direction” journey.
There is a dangerous point in the center of this, called Singularity — where frequency is infinite and physics rules are broken.
2. If the world start moving towards black hole
First the gravity of black hole will start to pull the world.
The world seems to be slowly “pulling” and “growing” from a distance — but the actual inside of it is terrifying.
3. When the world reaches Event Horizon:
Event Horizon is the fictional line around black hole, from which once something enters and never exits.
When the world goes to this limit, then—
One side of the world (which is towards the black hole) will feel much stronger gravity than the other side.
In this, the world will be taller in the process known as "Spaghettification".
(I mean the world will be dragged like a long, short "noodle" or "spaghetti"! )
4. How the Earth's Structure will collapse:
First the inner structure of the world will be broken — ghosts, mantles, core — all will tear each other apart.
Great heat will produce, because gravity will turn into heat and radiation.
The world will turn into completely molten plasma.
5. The consequences of the living creatures of the world:
Terrible tide-water ball will be formed before the world goes to black hole.
The atmosphere of the earth will be torn apart,
The sea will boil,
And all living creatures will be burned or torn instantly.
No one can see through any device — and not even out to the light.
6. People, mountains, plants, rivers, buildings — the consequences of all:
What will happen to the material?
* People will be torn into gravity, will break even to cells and nuclear levels.
* Animals and birds are destroyed by being spaghetify.
* The hill rocks will melt and shatter.
*Building will tear up to the nuclear level.