How long ago did the big bang catalyze the beginning of the universe?
a. 13.7 billion years ago
b. 1.37 billion years ago
c. 4 billion years ago
d. 40 billion years ago
ANS: A
The "big bang" was the catalyst for the formation of the universe. It is thought to have occurred
approximately 13.7 billion years ago at a concentrated geometric point. Information can be found in
the section Stars and Seas
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____________________ forms when a preexisting rock is subjected to high temperatures
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The transfer of heat from a hotter object to a cooler object by direct physical contact is called:
A) radiation. B) convection. C) conduction. D) evaporation.
Which of the following contracts most when the temperature is decreased? Equal volumes of
A) iron. B) wood. C) water. D) helium. E) All contract the same.