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 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 layer 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 contains more radioactive isotopes than layer A
Which fossil would be the best index fossil?
A
B
C
D
If the half-life for the sample is 2,000 years, how old is the sample when there is 25% of the parent element remaining?
2000
4000
6000
8000
In seafloor spreading, molten material rises from the mantle and erupts...
along the edges of the continents
at the north and south poles
along the mid-ocean ridge
in deep ocean trenches
Which type of evidence was NOT used to support the continental drift hypothesis?