What adjective describes fragmental materials, such as ash, explosively erupted from volcanoes?
a. metamorphic
b. intrusive
c. pyroclastic
d. cementation
e. sedimentary
c
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What is the wavelength of an electromagnetic wave that has a frequency of 1 Hz?
A) less than 1 m B) 1 m C) more than 1 m
Which European country is the principle trading partner of Nigeria, Uganda, and Tanzania?
A) France B) Germany C) China D) United Kingdom
Which of the following can cause enzyme activity to either increase or decrease?
A) increasing the substrate concentration B) changing the pH C) both a and b D) neither a nor b
The magnetic north pole is currently moving (toward /away from) the geographic North Pole, and the magnetic south pole is currently moving (toward /away from) the geographic South Pole
A) toward; toward B) toward; away from C) away from; toward D) away from; away from