Worst days on planet Earth

For more than four billion years, Earth has undergone difficult times. What else can happen? Can fateful encounter with the planet flew too close? Or deadly rays vyzhgut on the planet all life?
Life on earth is constantly teetering on the brink for a variety of reasons, ranging from volcanoes and ending izverezheniya tiny microbes that cause global cooling. Ended in a terrible times or they are coming to us only? We made a list of the seven most terrible days that may befall the planet earth.

Category: Scientists, experts, science

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