homophily in online dating - Absolute time dating

Simply stated, each bed in a sequence of sedimentary rocks (or layered volcanic rocks) is younger than the bed below it and older than the bed above it.

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Geologists generally know the age of a rock by determining the age of the group of rocks, or formation, that it is found in.

The age of formations is marked on a geologic calendar known as the geologic time scale.

BECAUSE THEY ARE UNSTABLE THEY GIVE OFF RADIATION TO TRY TO BECOME NORMAL.

THIS PROCESS OF GIVING OFF RADIATION TO BECOEM STABLE IS CALLED RADIOACTIVE DECAYEACH TIME AN ISOTOPE RELEASE RADIATION, IT CHANGES INTO A NEW MORE STABLE ELEMENT.

VARVES ARE LAYERS OF LIGHT AND DARK SEDIMENT THAT SHOW YEARLY CYCLES. Each spring or summer when the glacier was melting the glacier deposits a ton of sediment it was carrying into strems of water that are melting off of it.

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.

THE ORIGINAL RADIOACTIVE ISOTOPE IS CALLED THE PARENT ELEMENT.

THE MORE STABLE FORM IT TURNS INTO IS CALLED THE DAUGHTER ELEMENT.

The nuclear decay of radioactive isotopes is a process that behaves in a clock-like fashion and is thus a useful tool for determining the absolute age of rocks.

Radioactive decay is the process by which a “parent” isotope changes into a “daughter” isotope.

From the Dynamic Earth at the University of Leeds, a cross-linked series of static diagrams illustrates the underlying principle of radioactive decay, the concept of a decay constant, and isochron plots.

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