Question

how can you say earth is round?

Answer 1

Because there is no end of earth . Because if you start from a definite place then after some years you will come on that place after traveling whole world.

Answer 2

Answer:

The earth is round .

this is proved by various observations.

1) The time of sunrise and sunset

If the Earth had been flat, the sunrise and sunset at every place would have been the same .

2) The horizon

The horizon is the imaginary line where the sky and Earth appear to be meeting. This horizon widens with increase in height,which proves that the Earth is spherical.

3) Magellan's Circumnavigation

He started his journey from Spain , straight , and returned to Spain.

There are many more reasons