Answer key to radiometric dating assignment

In this activity, students begin a sequencing activity with familiar items — letters written on cards.

Once they are able to manipulate the cards into the correct sequence, they are asked to do a similar sequencing activity using fossil pictures printed on "rock layer" cards.

Yes, radioactive isotopes present in rocks and other ancient material decay atom by atom at a steady rate, much as clocks tick time away.

Lab Manual (Busch 9th Edition) Activity 2.8: The Origin of Magma 1. At 80 km depth, rocks will be heated to about _______ degrees Celsius 1.

(Question A1, Figure 2.7) According to the continental geothermal gradient, rocks buried 80 km beneath a continent would normally be heated to what temperature?

Ice cores showed the age of a military plane buried in the artic as thousands of years old.

Similarly, dendrochronology measures the tree rings in trees and assumes they represent years.