49. How many unconformities (including all three types) are there? A. 0 B. 1 C.

Question

49. How many unconformities (including all three types) are there?

A. 0

B. 1

C. 2

D. 4

E. 6

50. Which is the oldest of the following?

A. Fault P

B. Dikes S

C. Fault K

D. Dike E

51. Which of the following is NOT true?

A. The unconformity between X and B is an angular unconformity

B. The unconformity between V and O is a nonconformity

C. The unconformity between D and F is a nonconformity

D. The unconformity between G and L is an angular unconformity

E. None of the above

52. What is a correct sequence of ages from oldest to youngest?

A. B, K, M.G, D

B. X, B, Z, A, L

C. C, M, K, S, P

D. O, M, E, K, A

E. None of the above

53. After three half lives how many parent atoms will be left if there were 4 million

originally?

A. 2 million

B. 1 million

C. 500,000

D. 400,000

E. 100,000

54. 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

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

A. A volcanic quartz 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

Explanation / Answer

49) There are 2 unconformities namely Nonconformity,Angular unconformity and A blended unconformity(disconformity or nonconformity with no distinct separation plane or contact)

50) Fault K is the oldest of the following geological features

51) The unconformity between X and B is not an angular unconformity

52) The correct sequence of ages is O, M, E, K, A from old to young

53) After three half lives 500,000 parent atoms will be left if there were 4 million originally.At each time Half of the original value is reduced

54) Radioactive decay occurs at an exponential rate

55)  A 25,000 year old tree can be date with radiocarbon (C-14). Because all organic material has decaying Carbon-14 in it and we can date upto only 60,000years using C-14

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