________ is defined as the number of protons plus the number of neutrons
A) Isotopic number
B) Nuclear number
C) Mass number
D) Atomic number
E) Ionic number
Answer: C
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In modern world trade,
A) some places are still completely isolated and dependent on local resources. B) all parts of the world have eagerly, voluntarily participated in world trade. C) virtually all peoples have moved from self-sufficiency and cultural isolation to trade and cultural exchange. D) all trade is regulated by the United Nations.
How many hinge lines does a monocline have?
A) One B) Two C) Three D) Four
Considering the age of the Earth and that the half-life of the isotope uranium-238 (238U) is 4.5 billion years, and assuming no additional 238U was produced after the Earth formed, approximately what fraction is left on Earth?
A. one-third B. none C. eighty percent D. half
Why was the tamarisk tree brought to the United States?
a. To provide food for cattle. b. To help control soil erosion. c. To supply fast-growing lumber. d. For its valuable fruit.