The time necessary for one-half of the original number of radioactive atoms of an element to decay to a stable
daughter product is known as a(n) ____.
a. scale
b. metamorphosis
c. half-life
d. alpha decay
e. relative age
c
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What is one role of unpaired valance electrons?
A) They take part in the formation of different types of bonds. B) They keep the paired electrons separated to minimize interaction. C) They are the nonbonding electrons. D) They provide the number of Lewis dots. E) They tell us which Lewis dot structure is correct.
An object that has kinetic energy must be
A) moving. B) falling. C) at an elevated position. D) at rest. E) none of the above
The principle of relative age dating which can be used to determine when the river formed on the landscape is the principle of
A. cross-cutting relations. B. original horizontality. C. inclusions. D. superposition.
Which of the following layers in the earth has the highest density?
A) Asthenosphere B) Lithosphere C) Lower mantle D) Outer Core