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RADIOACTIVE ISOTOPES ARE UNSTABLE VERSIONS OF NORMAL ELEMENTS.
BECAUSE THEY ARE UNSTABLE THEY GIVE OFF RADIATION TO TRY TO BECOME NORMAL.
Thinner varves can indicate colder summers, because the glacier doesn’t melt as much and carry as much sediment into the lake.
For example, an especially warm summer might result in a very thick layer of sediment deposited from the melting glacier.The first method of finding the absolute age of an object is by examining tree rings.If we looked at a cross-section ofa tree or log we would notice that all through it are concentric circles radiating out from the center to the bark. Each ring is also different, and the thickness of each ring is representative of the length of the growing season.When the meltwater reaches a lake the heaiest sediments (sand and silt) sink to the bottom quickly and eventually formed thick layers of light colored rock.Later in the year, by wintertime, the clay has had enough time to settle to the bottom and it forms a thin layer of dark colored rock.
THE MORE STABLE FORM IT TURNS INTO IS CALLED THE DAUGHTER ELEMENT.