hemisphere

definition: 
A half of the earth, usually as divided into northern and southern halves by the equator, or into western and eastern halves by an imaginary line passing through the poles.
sentence: 
In both the northern and southern hemispheres aridity occurs at latitudes characterized by more or less permanent high pressure cells and hot dry subsiding air.
difficulty: 
easy
toefl frequency: 
2
toefl classification: