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2/27 ERS102 - 2/27 Glaciations and Maine Important Concepts...

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2/27 Glaciations and Maine Important Concepts 1) How glaciers form 2) Glacial features and interpretation 3) Hot glaciers shaped Maine’s landscape Numerical Age Radioactivity Carbon14 (radioactive) o Produced in atmosphere C14, C13, and C12 mixed in atmosphere and ocean o C12 Stable = 98% o C13 Stable = <1% o C14 radioactive = .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. o C12/C14 ratio changes with time BUT… o Variation in solar radiation= variations in C14 production o Oceans – reservoir time of over 4000 years
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