If a rock sample contains uranium and lead, and lead-204 is ...

[ericka1]

If a rock sample contains uranium and lead, and lead-204 is present, then
 a. both radiogenic and primordial lead are present.
  b. all the lead is primordial.
  c. neither radiologic nor primordial lead is present.
  d. all the lead is radiogenic.

Question 2

If a rock sample contains uranium and lead, but no lead-204 is present, then
 a. all the lead is radiogenic.
  b. all the lead is primordial.
  c. both radiogenic and primordial lead are present.
  d. neither radiologic nor primordial lead is present.

[Li Jun]

Answer to Question 1

a

Answer to Question 2

a

[ericka1]

TYSM

[adf223]

Thanks for the timely response, appreciate it