Potential evapotranspiration is the maximum evapotranspiration that would take place with ____
a. a cloudless sky
b. an unlimited supply of water
c. water at 99° C
d. air temperatures 10° C below current conditions
e. air at 0% relative humidity
b
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What type of cleavage would be exhibited by a mineral that has this arrangement of silicon tetrahedron? 
A. one direction of cleavage B. the mineral fractures instead of cleaves C. two nonperpendicular directions of cleavage D. two perpendicular directions of cleavage
All of the following statements about invasive species is true except
a. Approximately 40% of species listed as endangered in the United States are on the list because of threats from invasive species. b. Most successful invader species are specialists. c. Both the European wild boar and the Burmese python are problematic invasive species in the state of Florida. d. Some invasive species have arrived in the ballast water in ships from distant ports. e. The African honeybee (killer bee) was deliberately introduced.
Which country pays landowners to restore tree cover?
a. Panama b. Brazil c. Costa Rica d. China e. Norway
When did the Moon form?
a. in Hadean Eon b. in Archean Eon c. in Tertiary Period d. in Paleozoic Era