Rocks can begin to melt if
A) a decrease in pressure results in a sufficient decrease in the rock's melting point.
B) the rock's water content increases thereby decreasing the rock's melting point.
C) heated by rising magma from the Earth's interior.
D) all of the above.
E) none of the above.
Answer: D
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A rock weighs 30 N on Earth and another rock weighs 30 N on the Moon. Which rock has the greater mass?
A) the one on Earth B) the one on the Moon C) They have the same mass. D) not enough information
The sky is blue because
A) molecules scatter blue light more effectively than red light. B) molecules scatter red light more effectively than blue light. C) the Sun mainly emits blue light. D) the atmosphere transmits mostly blue light. E) the atmosphere absorbs mostly blue light.
The orbital period of a geosynchronous satellite is
A) 23 hours 56 minutes. B) 24 hours. C) 365.25 days. D) 12 years. E) 26,000 years.
The total number of comets orbiting the Sun is estimated to be about ________
A) 100,000 B) 1 trillion C) 1,000 D) 1 million