Answer:
a) I) the equatorial air mass
ii)the tropical air mass
III)the polar air mass
Iv)the arctic and antarctic airmasses
16)thermometer &hygrometer
Answer:Based on chemical composition, the atmosphere is divided into two broad layers: the homosphere and the heterosphere. The homosphere extends up to the height of 56 mi. (90 km.) and is characterised by uniformity in chemical composition.
Explanation: