What are 4 reason earth isn’t shaped like a cube?

Question

without knowing it’s a sphere but how do we know it’s not a cube? Why can’t it be a cube 

Answer 1

Funny question. Actually, Earth is ALMOST a sphere--it's an oblate spheroid, with many ups and downs on its surface (e.g. mountains).  Oblate meaning a bit fatter around the Equator, like yours truly.