Fun fact : Sailors in ancient greece already knew the earth was sphere like, because they could only see the upper part of faraway boat's sail.

edit : paint level over 9000

It is because of the gravity. The Earth's core consist primarily of an iron–nickel alloy, which has a big attraction field that keeps altogether the water and land part of the Earth. It is the same answer as why all planets are spheric bodies.

Planets are round because their gravitational field acts as though it originates from the center of the body and pulls everything toward it. With its large body and internal heating from radioactive elements, a planet behaves like a fluid, and over long periods of time succumbs to the gravitational pull from its center of gravity. The only way to get all the mass as close to planet's center of gravity as possible is to form a sphere. The technical name for this process is "isostatic adjustment."

any object with enough mass pulls itself into a sphere

HAHA its true.

The earth isn't much of a ball. It's actually got a few unflattering parts to it that make it a sphere, but one a 4yr old would draw.

nobody in his right mind ever thought the earth was flat. its known for 2000 years+ that the earth is a ball or egg, or something like that

You can travel in a straight line, following the equator, and you would end up in the same place you started from.

has anyone done that ?

Bacause physics and math, can easily proove it.

Its bascially possible to do with this 2 sticks each same lengh and shape, put into the ground and messureing the shadows.

You can also observe it, when ships sale out to sea.

RenCutypoison said:

Fun fact : Sailors in ancient greece already knew the earth was sphere like, because they could only see the upper part of faraway boat's sail.

edit : paint level over 9000