Presently glaciers cover less than 1% of the earth's surface
a. true
b. false
b
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Across the developing world, children are considered an economic investment because they will be able to work and contribute to the family's income.
a. true b. false
What is a half-life?
A. It is the time needed until 1/2 of the radiation is gone. B. It is the time it takes for 1/2 of the material to undergo radio decay. C. It is half of the lifetime of the radioactivity in a sample. D. It is the time it takes for 1/2 of the material to decompose. E. all of the above
In calm air, a typical cloud droplet falls over 600 times faster than a typical raindrop.?
a. True b. False
The single most important mechanism of transport for weathered overburden in the subarctic zones is ________
A) mass wasting B) frost wedging C) oxidation D) exfoliation E) hydrolysis