Standard time zones
A) are 15° wide because Earth rotates that distance in one hour.
B) have yet to be generally established.
C) are spaced at 5° intervals of longitude in North America.
D) are arbitrarily set based on international political boundaries.
E) are only used in the developed countries.
A
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A 10-kg brick and a 1-kg book are dropped in a vacuum. Gravitational force on the 10-kg brick is
A. 10 times the force on the 1-kg book. B. the same as the force on the 1-kg book. C. zero. D. 5 times the force on the 1-kg book.
Which of the following is true?
A) Lightning results from the buildup of electrical-energy polarity within clouds. B) Thunder is caused by rapid cooling of the air. C) Thunder is caused by rapid contraction of the air. D) Lightning is relatively uncommon on the Earth.
In the northern hemisphere, suppose you observe the upper-level winds blowing from the south. In which direction from you is the trough of low pressure?
A. west B. east C. north D. south
A volcanic mudflow is called a Lahar.
Indicate whether the statement is true or false.