We've all learned this one in school, right? "My very excellent mother just served us nine pizzas." The planets get further apart the further you go out from the sun, therefore Venus is closer to Earth than Mars, or indeed any other planet.
According to a recently released report from the journal Geophysical Research Letters, there are about 15 million gallons trapped underneath permafrost in the Northern Hemisphere, mostly under the Alaskan, Canadian, and Russian regions of the Arctic Circle.
We already knew that thawing Arctic permafrost would release powerful greenhouse gases. Scientists revealed it could also release massive amounts of mercury — a potent neurotoxin and serious threat to human health.