An Unstable Radioactive ________ Isotope Decays to a Stable ________

Q9: In a given area where you have

Q14: At the end of the Cretaceous (K/T

Q15: What kind of materials can be reliably

Q16: Carbon-14 is produced by cosmic rays reacting

Q18: Name the two Quaternary Epochs.

Q20: Which of the following geologic observations would

Q21: Which of the following best characterizes an

Q22: A few rare times in earth history

Q23: Which have been around longer, the benthonic

Q24: Which is the youngest geologic feature of: