How many calories are equal to one BTU? (One calorie = 4.186 J, one BTU = 1054 J.)
a. 0.252
c. 252
b. 3.97
d. 397
C
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Nuclear Reactions: The equation shows a fission reaction:
U + 
n ? 
Nb + X + 4 
nWhat is the missing term X in the equation?
A. 
Ag
B. 
Sb
C. 
Sb
D. 
Ag
E. 
Sb
Large, smooth, dark plains on the moon are called ____
a. ejecta blanket b. central peak c. maria d. multiringed basin e. Sinuous rilles
Tornadoes are rapidly rotating winds that blow counterclockwise around a small area of intense
A) high pressure. B) low pressure.
Which of the following is true of life on Earth?
A) Life, in the form of multicellular organisms, has existed on Earth for only about 2 million years. B) Life has existed on Earth for at least 3.4 billion years. C) The Cambrian explosion marks the formation of the first unicellular organisms on Earth. D) Complex multicellular organisms were present on Earth 2.5 billion years ago.