GEOGRAPHY IN THE NEWS:
When the earth passes through the debris left by a comet, for example, some of that interplanetary dust makes it all the way to the earth's surface. Ever wonder how much? By studying the accumulation of interplanetary dust in Antarctica, where there is virtually no source of terrestrial dust, French researchers estimate 5200 tons of micrometeorites fall to earth every year. www.cnrs.fr/en/more-5000-tons-extraterrestrial-dust-fall-earth-each-year
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