18. What do you call the number of years since the rock formed?
A. Extrusions
C. Absolute Age
B. Intrusions
D. Relative Age
19. How scientist determine the age of stratified rock using absolute dating?
a. Scientist analyze the isotopes of radioactive elements.
b. Scientists can use the relative amounts of stable and unstable isotopes present in an object to
determine the object's age.
c. Scientist try to determine the order in which events have happened during Earth's history.
d. A and B only
20. What is the basic difference between relative and absolute dating?
a. Absolute dating provides a computed numerical age in contrast with relative dating which
provides only an order of events.
b. Relative dating provides a computed numerical age in contrast with absolute dating which
provides only an order of events.
c. They rely on rocks and fossils to help them in their investigation
d. They both determine whether an event or object is older or younger than other events or
objects.​