One of the leading killers during explosive volcanic eruptions is a family of superheated gas, ash, and debris known as pyroclastic density currents. These tumbling, turbulent paroxysms rush downslope ...
I focus a lot of attention on NASA images of space, from our Moon to distant quasars. But NASA has a fleet of satellites which don’t look out, they look down, studying our home planet. One of the most ...
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