Which of the following is the expected temperature at which a cloud becomes completely glaciated?
A. 0°C
B. -5°C
C. -18°C
D. -40°C
Answer: D
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What is the approximated number of earthquakes detected every year?
a. One million b. One thousand c. One hundred d. A few
Which one of the following is true of hydrogen fuel cell technology?
A) Many homes were built in desert regions using the technology to collect and heat water. B) It has been used widely in NASA's spaceflight programs. C) The visionaries of the fossil fuel companies saw the need to develop this technology. D) The U.S. government wanted it for use in military operations. E) It was originally slated for use in cars by Ford.
Which main-sequence stars are the most massive?
A) yellow B) red C) blue D) orange
__________ is the prime factor in the reduction of habitat critical to the survival of Brazil's native species.
Fill in the blank(s) with the appropriate word(s).