Urban areas of East Africa will continue to be target destinations for employment opportunities, whether they exist or not, and rural-to-urban shift will drive the populations of cities such as Addis Ababa to expand drastically.
a. true
b. false
a. true
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What is the world's largest use of one fuel?
A) biomass B) growing corn for ethanol C) recycling D) slash-and-burn agriculture E) wood for cooking
Which of the following best describes why snow avalanches occur?
A. low temperatures followed by warmer weather B. loose, non-cohesive snowpack C. melting at the contact between the snow and underlying earth material D. high winds and drifting snow E. loss of friction along weak layers within a snowpack
A species of bird had an original range covering the entire eastern half of the United States from New England down to Florida, west to the Rocky Mountains. During a period of glaciation, the eastern part of the range was cut off from the western part
for 2000 years. Then the glaciers melted and the birds' original range was reestablished. During the separation, the western birds evolved a slightly different song and a darker wing color. Ornithologists are now studying this species to determine whether speciation has taken place. What evidence should they look for in their study? What will be an ideal response?
Which of the statements about mining waste is NOT true?
A. Mining waste often includes liquid waste that is stored in ponds on the surface. B. Mining waste often causes water pollution. C. Mining waste usually consists of waste rock which is dumped on the surface of the land near where the mine or where the ore is processed. D. Quantities of mining waste must be reported to the EPA.