The same index fossil is found in rock layers A and B that are separated by several miles. What can you infer about the relationship between the rock layers?
Layer A is older than B
The sediments in layer B were deposited before those in layer A
Layers A and B are probably about the same age
Layer B probably contains more radioactive isotopes than layer A
Which of these is an example of relative age?
Fossil A is older than Fossil B
Fossil A is 250 million years old
Fossil B is 200 million years old
Fossil B was formed 50 million years after Fossil A
If the half-life for the sample above is 2,000 years, how old is the sample when there is 25% of the parent element remaining?
2000
4000
6000
8000
Which of the following statements represents the absolute age of the subject?
Fossil A is older than Fossil B
Fossil C is 50 million years old
Fossil D is older than the last mass extinction
There is no way of determining absolute age
The earth is approximately 4.6 billion years old. How much of this time is considered to be Precambrian time?
