Sooner or later, mountains crumble into boulders, boulders crumble into rocks and pebbles, and so on, until wind and rivers carry sand and dust into the ocean, completing the geologic rock cycle. "But how [rocks] go from the mountain into that ocean bottom, that's what is not understood very well," said Jaakko Putkonen, a geologist with the University of North Dakota. Scientists from UND and other institutions discovered that chunks of rock break off of boulders in Antarctica once every 1,900 […]
The valley directly in front of us here is the upper end of the Salmon River. The pair of valleys beyond that are a tributary to the White River (closer), and the White River (farther). Palmer ice field/glacier appears to the right of the tree in the left middle, and Crater Rock and the Mount Hood summit are above that feature. The winds were from the east this day, so I don't think that cloud could be described as a lenticular.Photo unmodified. October 10, 2012. FlashEarth location.
The hardworking AERONET (AErosol RObotic NETwork) instrument in Baengyeong, South Korea was having a rough day. Every 15 minutes, the telescope-like device pointed its barrel at the sun to record its light and measure how much was blocked by airborne particles, or aerosols. July 13, 2012 was an overcast day and the light absorbed by the clouds dominated the measurements. But then, just after 1 p.m., the clouds parted, the instrument looked up, and data was collected. Only no one saw it.