An electrical signal is delivered to a transducer that changes the signal into a thump on a rock. As the wave travels through the rock, an electric sensor records the signal's travel time. What does this experiment help scientists to calculate?
A) the force of a wave
B) the magnitude of a wave
C) the effect of a medium on wave travel
D) the velocity of a wave
Answer: D
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A scientist identifies a rock sample as rhyolite. Why did he do so?
A) He observed that the rock has a lot of silica, making it mafic. B) He observed that the rock has a lot of silica, making it ultra-mafic. C) He observed that the sample has little silica, making it felsic. D) he observed that the sample has a lot of silica, making it felsic.
The CAFE standard is a common term when referring to energy and environmental issues in the United States. The acronym CAFE stands for
a. Corporate Average Fuel Economy. b. Consumer Applied Funding Energy. c. Corporate Alternative Fuel Energy. d. Consume Alternative Fuel Energy. e. Corporate Alternative Fuel Employment.
The three diseases that cause the majority of deaths worldwide are influenza, hepatitis-B, and SARS
Indicate whether the statement is true or false
Early post-World War II cooperation in Western Europe centered on transportation
Indicate whether the statement is true or false