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Geologic Time

ES.9

QuestionAnswer
Fossils from many different eras, periods and epochs are found where? Virginia
What can radiometric dating tell us about the age of rocks that the Law of Superposition cannot? Radiometric dating tells us how old the rocks are whereas the Law of Superposition can only be used to determine the relative age.
The history of the earth can be understood by studying what? Fossils and the ages of the rocks
Both relative dating and absolute dating can be used to determine what? The ages of rocks and their structures
At the end of eras are mass extinctions where many species of plants and animals do what? become extinct
Radioactive decay is reliable because radioactive elements decay at a ___________. constant rate of time called a half-life
In Virginia, fossils are found mainly in the ________. Coastal Plain, Valley and Ridge and Appalachian Plateau
Survival of the fittest would get rid of weaker species and the stronger species would continue ____. forward
The age of the Earth is ________. 4.6 billion years old
What are index fossils? they are fossils of plants or animals that were abundant
What is a fossil? The remains or impression of a prehistoric organism preserved in petrified form or as a mold or cast in rock
Explain what Half Life is. the length of time it takes for ½ (half) of the mass of a radioactive element (parent material) to change into a new stable (non-radioactive) element (daughter product)
mass extinctions are usually triggered by climate collapse which is usually a what? Ice Age
Describe the Paleozoic era. The Paleozoic Era is the beginning of life forming.
Created by: earthscience463
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