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    Radiometric dating of moon rocks

    Meteorites are among the oldest objects we know about - formed about 4.5 billion years ago. This article describes the principles and methods used to make that determination.

    There are well-known methods of finding the ages of some natural objects.

    The ratio of normal carbon (carbon-12) to carbon-14 in the air and in all living things at any given time is nearly constant.

    Maybe one in a trillion carbon atoms are carbon-14.

    In den letzten Jahren wurden an groen internationalen Forschungsprojekten vor allem die Tiefbohrungen am Bosumtwi-Impaktkrater in Ghana (Westafrika) und am Chesapeake Bay Impaktkrater an der Ostkste der USA durchgefhrt. Springer Verlag, Heidelberg, 347 pp (ISBN 3-540-00630-3) Koeberl, C.

    Diese Forschungen wurden finanziell durch den sterreichischen FWF und (unter anderem) das International Continental Drilling Program (ICDP) untersttzt. Weiters wurde 2009 eine Tiefbohrung am El'gygytgyn Meteoritenkrater im arktischen Teil Russlands durchgefhrt, wobei im Rahmen eines internationalen Projektes sowohl Paloklimafragen als auch die Untersuchung des Meteoritenkraters im Mittelpunkt stehen.

    ­The carbon-14 atoms that cosmic rays create combine with oxygen to form carbon dioxide, which plants absorb naturally and incorporate into plant fibers by photosynthesis.

    Animals and people eat plants and take in carbon-14 as well.

    There are some things that affect these measurements.Die Forschungsarbeiten an diesen Bohrkernen haben gerade 2010 begonnen. Springer Verlag, Heidelberg, 312 pp (ISBN 3-540-42286-2). (2002) Catastrophic Events and Mass Extinctions: Impacts and Beyond. Ab 2011 oder 2012 wird in einer weiteren internationalen Zusammenarbeit im Nordosten Chinas, im Songliao Becken, eine fast 10 km tiefe Bohrung niedergebracht, wobei Gesteinsschichten der letzten 150 Millionen Jahre detailliert untersucht werden sollen. 93, Springer Verlag, Heidelberg, 364 pp (ISBN 3-540-66368-1). (2001) Geological and Biological Effects of Impact Events. Geological Society of America, Special Paper 356, 746 pp (ISBN 0-8137-2356-6). Trees undergo spurts in growth in the spring and summer months while becoming somewhat dormant in the fall and winter months.When a tree is cut down, these periods are exhibited in a cross section of the trunk in the form of rings.

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