Isotropy and anisotropy: When a material is attacked by a liquid or vapor etchant, it is removed isotropically (uniformly in. all directions) or anisotropic etching (uniformity in vertical direction).
Some Questions Do Remain: 1  If the Earth was flat, we could travel to the place where the Earth and sky met. But we canât. 2  If the Earth was flat, we could reach the place where we could reach out and touch the Sun. But we canât. 3  If the Earth was flat, we could fall off the horizon. But we donâ 4 t. If the Earth was flat, it would simply fall.
The light of the sun is projeted in a spotlight form. So not all the Earth receive at the same time the sun light. On the Flat Earth theory, the sun and the moon orbit around the earth following opposite elliptical orbit. If you make extensive research on the subject, youâll see that proofs of flat earth are valid.