Question

Is the world really flat? Who proved that the Earth wasn't flat?

Answer 1

The world is not flat whereas it is spherical in shape. Long ago people started thinking that earth was flat! Christopher Columbus went for a voyage around the Earth and proved that the Earth is not flat!
 

Hope it helps you!

Answer 2

The world is not flat whereas it is spherical in shape. long ago people started thinking that earth was flat but after some days some scientists like christopher columbus set out and travelled around the world and observed that they reached the same place so they declared that earth is not flat but it is spherical in shape