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GeoWord of the Day and its definition:

balance year The period from the time of minimum mass in one year to the time of minimum mass in the succeeding year for a glacier; the period of time between the formation of one summer surface and the next. See also: net balance. Syn: budget year.

All terms and definitions come from the Glossary of Geology, 5th Edition Revised.
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New York Earth Science Teachers Association shared Earth Science Picture of the Day's photo. ... See MoreSee Less

Today's EPOD Hraunfossar and Northern Lights bit.ly/2r9QUXP Photographer: Gísli Már Árnason Summary Author: Gísli Már Árnason Shown above are the Northern Lights and the stunning Hraunfossar (lava falls), in western Iceland. These falls are formed from a stream flowing underneath the Hallmundarhraun lava field -- the stream empties into the Hvítá River. As the daylight period lengthens in spring and summer the aurora season comes to an end. This pale green aurora resulted from a moderate geomagnetic storm (Kp6 classification) that occurred in late March. The bright star on the right is Vega, in the constellation of Lyra. The Milky Way is hidden behind the auroral curtain, but the Andromeda Galaxy, the closest major galaxy to the Milky Way, is visible at the lower left. Photo taken on March 27, 2017. Photo Details: Camera Model: NIKON D810A; Lens: 35.0 mm f/1.4; Focal Length: 35mm (35mm equivalent: 35mm); Aperture: ƒ/1.4; Exposure Time: 5.000 s; ISO equiv: 6400; Software: Adobe Photoshop CS6 (Windows). Hraunfossar, Iceland Coordinates: 64.7028, -20.97772 ---------------------------- View today's Earth Science Picture of the Day at epod.usra.edu/ To contribute your images go to epod.usra.edu/blog/contribute-to-epod.html Twitter @EarthPic Instagram @earthpicoftheday

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New York Earth Science Teachers Association shared Yellowstone National Park's photo. ... See MoreSee Less

Summer has officially arrived and it came in with a bang! Happy #SummerSolstice2017!

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