Ƙasa (shinfidar ƙasa)
Ƙasa ita ce cakudewar organic matter, ma'adinai, gas, liquid, da organism wadanda suka hadu domin taimakawa wa rayuwa. Bangaren ƙasa ta Earth, da ake kira da pedosphere, Nada muhimman ayyuka hudu na amfanin ƙasa:

 amatsayin hanyar dake taimaka ma tsirrai girma
 amatsayin abunda ke ajiye ruwa, samar dashi da tace shi
 amatsayin abunda ke sauya Earth's atmosphere
 amatsayin wurin da halittu ke rayuwa

Dukkanin ayyukan nan, a zuwansu, suna sauya ƙasa.

Manazarta 

Ƙasa