Dunia ke 71% of surface khaara paani waala ocean se covered hae. Baaki 29% me patthar waala jamiin continent aur island ke ruup me hae. Dunia Solar System ke aur planet se interact kare hae, particularly jaada kar ke Suraj aaur Chandarma se. Dunia, Suraj ke around orbit kare hae har 365.25 din me. Ek nachaai ke ek din bola jaawe hae aur ek orbit ke ek saal bolaa jaawe hae. Dunia ke lage khaali ek chandarma hae.