Radiometric dating techniques a. are not based on the ...

[Brittanyd9008]

Radiometric dating techniques
 
  a. are not based on the phenomenon of radioactive isotope decay rates
  b. can be used to determine the absolute age of organic materials
  c. include the K/Ar but not carbon-14 methods
  d. are a form of stratigraphy
  e. are relative dating techniques

Question 2

If an isotope has a half-life of 4 billion years, then in 4 billion years what will happen?
 
  a. All of the original amount will have decayed.
  b. A quarter of the original amount will still remain.
  c. Half of the original amount will still be present.
  d. All of the original amount will still be present.
  e. The original amount will have doubled.

[Natalie4ever]

Answer to Question 1

b

Answer to Question 2

c