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.
In Iowa, Christina Dreier and her husband often must choose between paying bills and buying enough food for their family. Food stamps and the local foo... More In Iowa, Christina Dreier and her husband often must choose between paying bills and buying enough food for their family. Food stamps and the local food pantry provide some relief, but sometimes the Dreiers' best efforts aren't enough. They are among millions of Americans who struggle with hunger, and those numbers are on the rise. Read more about hunger in the United States online in National Geographic magazine: http://www.nationalgeographic.com/foodfeatures/hunger/ 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 13 hrs ago, Duration 4:50, Views 415
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