8) The basaltic dike in the above figure is ~ 1 Ma. Which radiometric dating tec

Question

8) The basaltic dike in the above figure is ~ 1 Ma. Which radiometric dating technique technique would you use to estimate an age for the dike?

A. Rb-Sr

B. K-Ar or Ar-Ar

C. Sm-Nd

D. A or B

E. None of the above

9) After three half lives how many parent atoms will be left if there were originally 2 million?

A. 2 million

B. 1 million

C. 500,000

D. 400,000

E. 250,000

10) Which statement IS true about radioactive decay?

A. It occurs at a constant rate

B. It occurs at a slow, variable rate

C. It occurs at an exponential rate

D. It is a finite process

E. It occurs slowly at first, then speeds up

11) Which of the following could you date with radiocarbon (C-14)?

A. A volcanic feldspar grain 10,000 years old

B. A 25,000 year old tree

C. An oyster 10 million years old

D. Remains of a million year old bone

12) Dinosaurs occurred during which Era?

A. Cenozoic

B. Paleozoic

C. Mesozoic

D. Cretaceous

E. None of the above

13) What is soil?

A. Rock fragments

B. Regolith

C. Gravel

D. Sand

E. Volcanic ash

14) What processes and conditions produce soils?

A. Biological

B. Chemical and Physical weathering

C. Pollution

D. Precipitation

E. A, B and D

Explanation / Answer

8) none of the above . because all of the above mentioned methods have half lifes more than 1 Ma

9) 250,000

10) It occurs at a constant rate

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