About ____ of the world's people are at risk from malaria
a. two million
b. 10 percent
c. 1 billion
d. 25%
e. Half
E
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Evaluate which energy source seems to be most promising for China's future energy needs
What will be an ideal response?
How did the Red Sea, shown between Arabia and Africa in this figure, form?
A. subduction of Africa beneath Arabia B. subduction of Arabia beneath Africa C. continental rifting followed by seafloor spreading D. a continental collision E. transform faulting followed by a continental collision
Streams with perennial flow continue to receive water between storms because of:
a. aquicludes. b. traction. c. peak flow. d. flood crests. e. base flow.
Tornadoes that form ahead of an advancing cold front tend to move from the ____
a. northeast toward the southwest b. southwest toward the northeast c. northwest toward the southwest d. southeast toward the northwest e. northeast toward the northwest