The bright side of the waxing crescent moon is toward the ______________
Fill in the blank(s) with correct word
west
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In general, what happens to the density and temperature of a gas as it expands?
A) It gets less dense and cooler. B) It gets denser and cooler. C) It gets less dense and hotter. D) It gets denser and hotter.
_________________ refers to the ability of a telescope to produce bright images
Fill in the blank(s) with correct word
Which of the following causes mutations in living organisms?
A) natural selection B) a changing environment C) reproduction D) ultraviolet light and toxic chemicals E) the greenhouse effect
Characteristics of Waves: An earthquake generates three kinds of waves: surface waves (L-waves), which are the slowest and weakest, shear (S) waves, which are transverse waves and carry most of the energy, and pressure (P) waves, which are longitudinal waves and are the fastest. The speed of P waves is approximately 7 km/s, and that of S waves is about 4 km/s. People do not generally feel the P waves, but animals seem to be sensitive to them. If a person reports that her dog started barking 20 seconds "before the earthquake," then approximately how far was the origin of the earthquake?
A. 100 km B. 200 km C. 300 km D. 400 km E. 500 km