Gravity.
The gravity of the earth is always pulling everything towards it. Nothing can fall off the earth because everything wants to fall towards the center of the planet.
Even the moon is being pulled towards the earth. That's the only thing that keeps it from drifting off into space.
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umm: "The Earth is round"? ------------------------------------------------ The Earth is not round - it is an oblate spheroid. ---------------------------------------------------------------------------- A (slightly) oblate spheroid seems pretty "round" to me.
Pythagoras stated the earth was round
Yes, it is a fact that the Earth is round.
The moon rotates round the Earth.
There are wonderful pictures from space of earth. In them you can see it is round. The Ancient Greeks knew it was round.
he found out the earth was round when he studied geography
The Earth never became round. It has always been round in shape since it was formed at the beginning of time.
The Gupta Empire astronomers proved the earth was round by studying the moon during a lunar eclipse. They noticed that the earths shadow on the moon was round, meaning that the earth itself was round.
The Earth moves around the sun.
Galileo Galilee proved that the earth is round by earths shadow on the moon.
The Earth is round the earth was round