Temperatures within these features can reach 100 million degrees Kelvin:
A) granules.
B) flares.
C) sunspots.
D) the solar wind.
Answer: B
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Which of the following approaches is the most effective to protect fruit trees from frost?
A. Mix cold air at the surface with the colder air above. B. Spray the trees with a fine mist of water. C. Keep the air as still as possible. D. Warm the fruit trees with heated air.
Anthracite is a very low-grade coal that has not been exposed to very much heat or pressure. Indicate whether the statement is true or false
Which of the major revolutions was most associated with our increased ability to engage in modern warfare using guns and bombs?
A) The Neolithic Revolution B) The Medical Revolution C) The Green Revolution D) The Industrial Revolution
The Sun is considered an "average star."
Indicate whether the statement is true or false