Question

why we are does not reaches to the center of the earth because of gravity?​

Answer 1

$\huge\mathfrak\pink{Answer}$

Assuming uniform density of the Earth, the gravity decreases as you go towards the center until it reaches zero at the center. The reason it is zero is because there is equal mass surrounding you in all directions so the gravity is pulling you equally in all directions causing the net force on you to be zero.

Answer 2

Explanation:

Assuming uniform density of the Earth, the gravity decreases as you go towards the center until it reaches zero at the center. The reason it is zero is because there is equal mass surrounding you in all directions so the gravity is pulling you equally in all directions causing the net force on you to be zero.