uniform com dating site - Radioactive dating worksheet

What 2 scientists set up an experiment that simulated the atmosphere of early earth? What gases did the early atmosphere contain primarily? What bacteria live in harsh environments containing methane gas? Oxygen didn’t become part of our atmosphere until what process started taking place? (Evidence of the same fire may be seen as a layer of ash in the rocks to correlate a rock layer with the tree rings).

radioactive dating worksheet-79

Life begins as single cells about 3.5 Billion Years ago. Most of the life that has evolved (99.9%) has become extinct.

Ex.: Cro-Magnon Man is extinct because they evolved into modern Homo-sapiens.

Name the 4 eras of earth’s history in order beginning with the oldest & going to present day.

Name the period in which each of these events occurred: a.

Ways of Measuring Absolute Time Tree rings- every year a tree grows a new ring.

When the tree dies, the rings can be counted and events such as forest fires can be dated.

Mass Extinctions There have been several mass extinctions that have caused widespread endings to species.

Founded in 2002 by Nobel Laureate Carl Wieman, the Ph ET Interactive Simulations project at the University of Colorado Boulder creates free interactive math and science simulations.

Photo by Phil Medina Volcanic time markers - a layer of volcanic dust covering layers.

When a violent eruption of a volcano occurs it may send dust high into the atmosphere where it can spread over the entire planet.

A closer examination (not possible from this picture) would reveal contact metamorphism where the intruding igneouos rock "cooked" the pre-existing sedimentary layers.

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