If an isotope has a half-life of 50 million years and an 1/8 of the sample remaining consists of that
isotope, the age of the rock from which it was taken is:
a. 400 million years.
b. 300 million years.
c. 150 million years.
d. 800 million years.
e. none of the above
Q. 2 -
The loss of two protons and two neutrons from the nucleus is:
a. alpha decay.
b. beta decay.
c. electron decay.
d. electron capture.
e. half-life decay
Q. 3 -
The loss of an electron from a neutron in the nucleus is called:a.
alpha decay.
b. beta decay.
c. electron decay.
d. electron capture.
e. half-life decay
Q. 4 -
The Colorado Plateau has a record of geologic events occurring over about 2 billion years that was puttogether:a.
in a sequence found in the Grand Canyon.
b. in a sequence from a drill core through the Plateau.
c. by correlating the uppermost rocks in one area with the lowermost equivalent rocks in
another area.
d. in a sequence exposed in the Colorado Rockies.
e. in a sequence spanning the entire United States.
Q. 5 -
Concurrent range zones are used in fossil correlation because most fossils:a.
have long geologic ranges.
b. are very rare.
c. are geographically restricted.
d. are not common.
e. are not well preserved.
Q. 6 -
The time equivalence of strata is determined by:
a. correlation of unusual lithologies.
b. correlation of key beds.
c. correlation of fossils.
d. lateral tracing.
e. superposition
Q. 7 -
The principle that states that an igneous intrusion or a fault is younger than the rocks that it intrudes or
cuts is the principle of:
a. cross-cutting relationships.
b. inclusions.
c. fossil succession.
d. uniformitarianism.
e. superposition.
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