2/27Glaciations and MaineImportant Concepts1)How glaciers form2)Glacial features and interpretation3)Hot glaciers shaped Maine’s landscape•Numerical AgeRadioactivity•Carbon14 (radioactive)oProduced in atmosphere•C14, C13, and C12 mixed in atmosphere and oceanoC12Stable = 98%oC13Stable = <1%oC14radioactive = .0000001%•Plants and animals ingest or breath CO2 •C14/C12 constant while organism is alive•When organism dies, C14 amount decreases at regular rate (half-life= 5730 years). Age calculated. oC12/C14ratio changes with time•BUT…oVariation in solar radiation= variations in C14 production oOceans – reservoir time of over 4000 years
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sea level, Glaciology, earth Marine Inundation Sea, Age Radioactivity Carbon14