best photoset I’ve ever seen
photos of sakurajima, the most active volcano in japan, by (click pic) takehito miyatake (previously featured) and martin rietze. volcanic storms can rival the intensity of massive supercell thunderstorms, but the source of the charge responsible for this phenomenon remains hotly debated.
in the kind of storm clouds that generate conventional lightning, ice particles and soft hail collide, building up positive and negative charges, respectively. they separate into layers, and the charge builds up until the electric field is high enough to trigger lightning.
but the specific mechanism by which particles of differing charges are separated in the ash cloud is still unknown. lightning has been observed between the eruption plume and the volcano right at the start of an eruption, suggesting that there are processes that occur inside the volcano to lead to charge separation.
volcanic lightning could yield clues about the earth’s geological past, and could answer questions about the beginning of life on our planet. volcanic lightning could have been the essential spark that converted water, hydrogen, ammonia, and methane molecules present on a primeval earth into amino acids, the building blocks of life.
(see also: previous volcanology posts)
FACT: For every $1 we invest in our national parks, our economy sees $10 in return. Get out to a national park today (admission is free) to celebrate the 98th birthday of the National Park Service.
Chand Baori located in India. It is one of the oldest stepwell in India, and is considered to be among the biggest in the world. Built during the 8th and 9th century it provided the surrounding areas with a dependable water source for centuries. The green water at the base of the well is no longer in use.