Lightning in volcanic ash
If a volcanic eruption is not impressive enough already, try seeing it when lightning is involved. Normally ash and dust are electrically neutral. However, when the two elements are emanating from a volcano they are (obviously) very hot, and can have positively and negatively charged ions. These in turn cause electric and magnetic fields, with the result that the positively and negatively charged ions separate from each other. This process can then add severe lightning to a volcanic ash cloud.
Before the advent of agriculture 10,000 years ago, humans got their food by hunting, gathering, and fishing. Scientists are turning to these ancient me... More Before the advent of agriculture 10,000 years ago, humans got their food by hunting, gathering, and fishing. Scientists are turning to these ancient methods of subsistence for insights into how we can feed our growing global population in years to come—without overwhelming the planet. In its September 2014 issue, National Geographic magazine explores the evolution of the human diet across a wide spectrum of cultures: http://www.nationalgeographic.com/foodfeatures/evolution-of-diet/ By 2050 we'll need to feed two billion more people. Click here for a special eight-month series exploring how we can do that—without overwhelming the planet: http://food.nationalgeographic.com.
Date 23 hrs ago, Duration 1:19, Views 237
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