Key 2 Science - Physics, Chemistry, Biology and Math Basics

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Earth is spherical. A sphere attracts things to its center. Earth’s radius is 6400km. The biggest whole on earth we have is around 12km deep.
What if we dig a tunnel through the center of the earth and leave something in that big hole? What will happen to that object? What will be the properties of this object’s motion?
How gravity will affect the motion of this object? Will it get stuck at the earth’s center as there is no gravity at the center? Or will it go through the center and will reach the other end? Will it burst into the sky of the other end? Can we travel from one end to another end of the earth this way? Let’s jump into this topic and understand clearly "what happens if we fell through the center of the earth".

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We all know that the earth is rotating on its own axis. If we leave the earth's surface and go up a few kilometers in the air, will we see the earth's rotation from there?
As the earth is rotating, after staying in the air for a few hours, when we'll land back on earth, will we land in a different place? Can we travel the earth this way for a low cost?
Let's see what Physics says.