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Earth History Review

TermDefinition
preserved remains or traces of organisms that lived in the past fossils
include teeth, bones, or shells body fossils
can include footprints, burrows, or even wastes trace fossils
an imprint of an organism left in rock, no organism is left mold fossils
organisms that lived over a wide area & for a fairly short period of time. index fossils
age in comparison with other rocks, either younger or older. relative age
deeper layers must be older than layers closer to the surface law of superposition
divisions in Earth history geologic time scale
the time it takes for half of a given amount of an isotope to decay half-life
rate of decay of can be used to estimate the absolute ages of fossils and rocks radiometric dating
The best-known method of radiometric dating carbon-14 dating
Most fossils are preserved in this type of rock sedimentary rocks
tree sap may cover an organism and then turn into thus trapping the DNA of an organism amber
the largest blocks of time on the geologic time scale are called eons
You can tell how long the tree lived by counting these tree rings
has a half-life of 5,730 years Carbon-14
Created by: nancestrand
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