The runoff channels on Mars were most likely formed by
A) melting underground ice.
B) catastrophic, but rare flooding
C) the annual melting of the polar ice caps.
D) glaciers.
E) rain that was part of a water cycle.
B
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This image shows the velocity of gas moving toward or away from us on the Sun's surface, as measured through Doppler shifts; the key indicates the measured velocity, with negative velocities indicating gas moving toward us and positive velocities away from us. Based on this map, about how fast is the sun rotating at its equator? (Hint: determine the speed at which equatorial gas is moving toward us on one side of the equator and away from us on the other.)
A) about 200 m/s B) about 2000 m/s C) about 20,000 m/s D) The Sun is not rotating.
The average speed of light is greatest in
A) red glass. B) orange glass. C) green glass. D) blue glass. E) same in all of these
Many facilities that burn wood and hog waste (residues) are currently operating in the United States
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Explain the operation of a constant-volume gas thermometer
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