An non-conformity is: A. formed between layers of non-sedimentary rocks B. requi

Question

An non-conformity is:

A. formed between layers of non-sedimentary rocks

B. requires a rise in sea level to form

C. forms from erosion of sedimentary rocks

D. forms from erosion of non-sedimentary rocks

E. formed between layers of sedimentary rocks

Which of the following is not a relative age principle?
A. principle of fossil succession

B. principle of radiometric dating

C. principle of cross-cutting relationships

D. principle of superposition

E. principle of inclusion

A radioactive isotope has a half-life of 20,000 years. Thus:
A. after 20,000 years, the half-life will be 10,000 years

B. after 20,000 years, half of the nuclei of the isotope will have decayed

C. after 20,000 years, twice the number of the daughter isotope will be formed

D. the age of the rock sample is 20,000 years

E. None of the above

The principle of cross-cutting applies only to:

A. sedimentary and some rocks

B. sedimentary and metamorphic rocks

C. metamorphic and igneous rocks

D. faults, unconformities and metamorphic rocks

E. None of the above

In radioactive decay of an atom:

A. the atom becomes a member of a different element

B. the mass of the atom can not change

C. the number of protons can stay the same, but the number of neutrons always changes

D. the daughter isotope is half the mass of the parent isotope

E. None of the above

Explanation / Answer

An non-conformity is: D. forms from erosion of non-sedimentary rocks because A nonconformity exists between sedimentary rocks and metamorphic or igneous rocks when the sedimentary rock lies above and was deposited on the pre-existing and eroded metamorphic or igneous rock.

Which of the following is not a relative age principle? B. principle of radiometric dating because it determines absolute age.

A radioactive isotope has a half-life of 20,000 years. Thus: B. after 20,000 years, half of the nuclei of the isotope will have decayed because half life is is the time required for the amount of something to fall to half its initial value.

The principle of cross-cutting applies only to: B. sedimentary and metamorphic rocks because Cross-cutting relationships is a principle of geology that states that the geologic feature which cuts another is the younger of the two features. It is a relative dating technique in geology. generally igneous intrusive rocks cross cut the country rock.

In radioactive decay of an atom: A. the atom becomes a member of a different element because is the process by which the nucleus of an unstable atom loses energy by emitting radiation, including alpha particles, beta particles, gamma rays andconversion electrons. here the parent atom changes to daughter atom which are of different atomic number and mass hence different elements.

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