What can fossils tell scientists about Earth's past? How does geological time help scientists keep track of events in Earth's history?
Describe strata.
Which organisms on the geologic time scale are now extinct?
What are the two main processes scientists use to measure the age of Earth and its parts?
What is another name for radioactive dating?
How do we use relative dating to determine the age of a fossil, artifact, or rock layer?
According to the law of superposition, where would you find objects with an older relative age?
Name two index fossils. Why are these fossils important to the practice of relative aging?
How do we use radioactive dating to determine the age of a fossil, artifact, or rock layer?
If you needed to find the exact age of an object, which age analysis process would you use? Why?
How does radioactive decay help scientists determine the exact age of an object?
Carbon-14 is best used to find the age of:
Uranium-235 is best used to find the age of:
What is one limitation of radioactive dating?