Interval of time when the earth's magnetic field is oriented so that magnetic north pole is approximately in the same positions as the geographic south pole. Photosynthesis 3: The temperature at which this happens is known as the closure temperature or blocking temperature and is specific to a particular material and isotopic system. CS1 maint: A relatively short-range dating technique is based on the decay of uranium into thorium, a substance with a half-life of about 80, years.
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What subject do you teach? It is accompanied by a sister process, in which uranium decays into protactinium, which has a half-life of 32, years. Visual Browse Close. Interval of time when the earth's magnetic field is oriented so that the magnetic north pole is approximately in the same position as the geographic north pole neutrons:
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