cosmogenic - pertaining to the branch of astronomy dealing with the origin and history and structure and dynamics of the universe; "cosmologic science"; "cosmological redshift"; "cosmogonic theories of the origin of the universe"The glacial chronicles: graduate student Benjamin Linhoff spent several months over the past two summers studying a glacier at a remote camp on the Greenland Ice Sheet.Here are excerpts from his blog describing life and work there Isotopes Laboratory, Kimmel Center for Archaeological Science, Weizmann Institute of Science, Rehovot 76100, Israel; Department of Land of Israel Studies and Archaeology, Bar-Ilan University, Ramat-Gan 52900, Israel nuclides in geomorphology and earth-surface processes; flood dynamics; rock glaciers; landscape change in the Arctic; and plate tectonics in Siberia, Western North America, North Africa, India, and Northwest Australia.Cartoon illustrating cosmogenic nuclide exposure ages. A glacier transports an erratic boulder, and then recedes, exposing it to cosmic rays.Spallation reactions occur in minerals in the rocks upon bombardment by cosmic rays.Cosmogenic nuclides (or cosmogenic isotopes) are rare isotopes created when a high-energy cosmic ray interacts with the nucleus of an in situ Solar System atom, causing nucleons (protons and neutrons) to be expelled from the atom (see cosmic ray spallation).These isotopes are produced within Earth materials such as rocks or soil, in Earth's atmosphere, and in extraterrestrial items such as meteorites.Boggle gives you 3 minutes to find as many words (3 letters or more) as you can in a grid of 16 letters. Letters must be adjacent and longer words score better. English dictionary Main references Most English definitions are provided by Word Net .
Cosmogenic nuclide dating uses the interactions between cosmic rays and nuclides in glacially transported boulders or glacially eroded bedrock to provide age estimates for rock at the Earth’s surface.
Some of these radioisotopes are tritium, carbon-14 and phosphorus-32.
Certain light (low atomic number) primordial nuclides (some isotopes of lithium, beryllium and boron) are thought to have arisen not only during the Big Bang, and also (and perhaps primarily) to have been made after the Big Bang, but before the condensation of the Solar System, by the process of cosmic ray spallation on interstellar gas and dust.
Surface exposure dating is a collection of geochronological techniques for estimating the length of time that a rock has been exposed at or near Earth's surface.
Surface exposure dating is used to date glacial advances and retreats, erosion history, lava flows, meteorite impacts, rock slides, fault scarps, and other geological events.