Time of the Fourth Ice Age Many scientists believe there have been four ice ages in the past 1 million years. Before the technique of carbon dating was known, geologists erroneously believed that the retreat of the Fourth Ice Age began about 25 , 000 years ago. In 1950 , logs from ancient spruce trees were found under glacial debris near Two Creeks, Wisconsin. Geologists determined that these trees had been crushed by the advance of ice during the Fourth Ice Aga Wood from the spruce trees contained 27 % of the level of C 14 found in living trees. Approximately how long ago did the Fourth Ice Age actually occur?
Time of the Fourth Ice Age Many scientists believe there have been four ice ages in the past 1 million years. Before the technique of carbon dating was known, geologists erroneously believed that the retreat of the Fourth Ice Age began about 25 , 000 years ago. In 1950 , logs from ancient spruce trees were found under glacial debris near Two Creeks, Wisconsin. Geologists determined that these trees had been crushed by the advance of ice during the Fourth Ice Aga Wood from the spruce trees contained 27 % of the level of C 14 found in living trees. Approximately how long ago did the Fourth Ice Age actually occur?
Solution Summary: The author explains that the fourth ice age occurred approximately 10,911 years ago.
Time of the Fourth Ice Age Many scientists believe there have been four ice ages in the past
1
million years. Before the technique of carbon dating was known, geologists erroneously believed that the retreat of the Fourth Ice Age began about
25
,
000
years ago. In
1950
, logs from ancient spruce trees were found under glacial debris near Two Creeks, Wisconsin. Geologists determined that these trees had been crushed by the advance of ice during the Fourth Ice Aga Wood from the spruce trees contained
27
%
of the level of
C
14
found in living trees. Approximately how long ago did the Fourth Ice Age actually occur?
The half life of a certain element is about 5600 years. Use the radioactive formula to complete parts a and b.
a. A pice of cloth is painted with organic dyes. By analyzing the dye in the cloth, it is found that only 64% of the certain element remains. When was the cloth painted?
b. A well preserved piece of wood found at a site has 12.9% of the certain element that it must have had when it was alive. Estimate when the wood was cut.
An archaeologist found a burial jar when excavating in an ancient village. To determine the age of the
burial jar, carbon dating is to be performed on the remains inside the jar. Carbon dating involves
quantifying the current amount of carbon-14 (half-life 5,730 years) present in an artifact, then using that
information to know how old the artifact is. If the remains inside said burial jar was currently found to
have 5/7 of the original amount found on alive individuals, estimate how old the jar is based on the
information regarding corpse inside the jar. Assume the rate of decay of carbon-14 is proportional to the
current amount. Express your answers accurate to four decimal places. No need to put units of
measurement. Do not put spaces.
4. How old is a hominid skull with 30% of its original C14 concentration, given that the half-life of C14 is 5730
years? Report to the nearest year (a whole number)
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