(UFMG - 2004)
Why is the South Pole colder than the North Pole? Robert Bindschadler, a senior fellow and glaciologist at NASA's Goddard Space Flight Center, explains.
Both polar regions of the earth are cold, primarily because they receive far less solar radiation than the tropics and mid...
(UFMG - 2004)
TEXTO PARA A PRÓXIMA QUESTÃO:
Dispatches from the Vanishing World
50 acres of tropical rainforest are said to be disappearing every minute. Millions of species of animals and plants around the world are going extinct at an ever-accelerating rate, many of them b...
(UFMG - 2002)
TEXTO PARA A PRÓXIMA QUESTÃO:
T R E N D S
After Some Sleepy Years, Yo-yos Are Back Up
LIKE INFLUENZA, 1THE YO-YO rage seems 2to break out, inexplicably and virulently, every decade or s...