The Columbia River basin will see an increase in flooding over the next 50 years as a result of climate change, new modeling from Oregon State University indicates. The magnitude of flooding -- the term used to describe flooding severity -- is expected to increase throughout the basin, which includes the Columbia, Willamette and Snake rivers and hundreds of tributaries. In some areas, the flooding season will expand, as well. The findings are based on natural river conditions and do not take into account potential flood control measures, including dams, but the increases are significant nonetheless, said study co-author Philip Mote, a professor in the College of Earth, Ocean, and Atmospheric Sciences and dean of the Graduate School at OSU. The findings were published recently in the journal Hydrology and Earth System Science. The study emerged out of Queen's work on her honors thesis as an undergraduate in the University of Oregon's Robert D.
Surface exposure dating - Wikipedia
This led to a big increase in cosmic and solar particles bombarding our planet because the magnetic field normally acts like a shield, deflecting these charged particles away from the Earth. Satellites would be rendered useless, our smartphone navigation apps would fail, and there would be major disruptions of our power distribution systems. This sediment has captured , years of history. So, how does a lake sediment provide evidence of a geomagnetic excursion? Magnetic particles are eroded from rocks, and make their way to a lake by wind or water, where they settle on the lake bottom. The deeper we drill, the further back in time we go. We travelled to a small sub-alpine lake in western Tasmania, where we drilled down into the sediment from a makeshift floating platform rigged to two inflatable rafts.
The dating and interpretation of a Mode 1 site in the Luangwa Valley, Zambia
Carbon, which is radioactive, is the isotope used in radiocarbon dating and radiolabeling. Another isotope, carbon, is useful in studying abnormalities of metabolism that underlie diabetes mellitus, gout, anemia, and acromegaly. Radioactive isotopes of carbon 14 C and phosphorus 32 P have been valuable in identifying the intermediate compounds formed during carbon assimilation.
Radiometric dating , radioactive dating or radioisotope dating is a technique which is used to date materials such as rocks or carbon , in which trace radioactive impurities were selectively incorporated when they were formed. The method compares the abundance of a naturally occurring radioactive isotope within the material to the abundance of its decay products, which form at a known constant rate of decay. Together with stratigraphic principles , radiometric dating methods are used in geochronology to establish the geologic time scale. By allowing the establishment of geological timescales, it provides a significant source of information about the ages of fossils and the deduced rates of evolutionary change.