A ceilometer, an instrument included in the Automated Surface Observing System (ASOS) instrument array, is used to measure
A) wind speed and direction.
B) visibility.
C) cloud height.
D) amount of precipitation.
E) relative humidity.
C
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The mass number of an element is
A. the sum of the isotopes. B. the sum of the electrons and the neutrons. C. the sum of the protons and the neutrons. D. the number of protons. E. the sum of the electrons and the protons.
What was the most damaging type of eruption that occurred at Vesuvius in Italy?
A) A huge landslide caused a lateral blast that knocked down trees and buildings. B) A fast-moving viscous lava flow flowed through the middle of Pompeii. C) The volcano was so heavy that it caused part of the island to collapse. D) One or more pyroclastic flows hit the city of Pompeii. E) None of these are correct.
Which is not a characteristic of an arthropod?
A) Exoskeleton B) Articulation of appendages C) Striated muscle D) Central nervous system
Which of the following objects do you expect to find at the center of a planetary nebula?
A. planet B. black hole C. white dwarf D. neutron star