Which of the following agricultural techniques requires more and more land to be cleared every two years due to soil exhaustion?
a)swideen agriculture
b)terraced farming
c)wet rice agriculture
d)dry rice agriculture

Which measure of humidity, relative humidity or dew point, best describes the actual quantity of water vapor in a mass of air

The earth rotates on its axis and revolves around the sun every

What statement about charlemagne is not true? a. charlemagne's empire collapsed during his rule b. charlemagne sent missionaries throughout europe c. charlemagne encouraged the arts and education d. charlemagne ruled much of western europe a. charlemagne's empire collapsed during his rule