Why do we think Mercury has so many tremendous cliffs?
A) They were probably carved in Mercury's early history by running water.
B) They were probably formed by tectonic stresses when the entire planet shrank as its core cooled.
C) They probably formed when a series of large impacts hit Mercury one after the other.
D) They are almost certainly volcanic in origin, carved by flowing lava.
E) They represent one of the greatest mysteries in the solar system, as no one has suggested a reasonable hypothesis for their formation.
B
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____ has (have) wavelengths that are shorter than visible light. I. Gamma-rays II. Ultraviolet light III. Infrared radiation IV. X-rays
a. I & II b. I & IV c. II & III d. II, III, & IV e. I, II, & IV
The age of a star cluster can be determined from the ____________________ of the cluster
Fill in the blank(s) with correct word
If a gas cloud shrinks, its gravitational potential energy is converted into
A) chemical energy. B) thermal energy and radiative energy. C) kinetic energy and sound waves. D) only radiative energy.
A pair of like electric charges
1) repel each other, 2) attract each other, and a pair of like magnetic poles 3) repel each other. 4) attract each other.