Flowing water erodes stream channels by
A) chemical weathering.
B) hydraulic action and abrasion.
C) chemical weathering, hydraulic action, and abrasion.
D) channel erosion and abrasion.
Answer: C
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Why can a rather small meteorite make such a big crater when it hits?
A. It is traveling so fast that it has a very large kinetic energy even with small mass. B. It is so hot from its passage through the air that it melts the surroundings. C. Air pressure on the leading side of the meteorite forms a shock wave that blows out the crater. D. Meteorites are much harder than the surface of the planet, and punch through it easily.
The "aspect ratio" of thickness to width of the Galactic disk is about
A) 1:2. B) 1:5. C) 1:10. D) 1:100. E) 1:1,000.
Why is Europa considered a good candidate for the possible existence of life?
A) Strong evidence suggests that it has a deep, subsurface ocean of liquid water. B) The Galileo spacecraft found strange seasonal changes on its surface that look like they could be due to life. C) It is located within our Sun's habitable zone. D) It has a thick atmosphere with a surface pressure greater than that on Earth.
You stand by the railroad tracks as a train passes by. You hear a 1 020-Hz frequency when the train approaches, which changes to 760 Hz as it goes away. How fast is the train moving? The speed of sound in air is 340 m/s
a. 30.2 m/s b. 34.5 m/s c. 40.1 m/s d. 49.7 m/s e. 45.6 m/s