A planet is most likely to have volcanic and tectonic activity if it has
A) low surface gravity.
B) high surface gravity.
C) low internal temperature.
D) high internal temperature.
E) a dense atmosphere.
D) high internal temperature.
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If it were not for the greenhouse effect on Earth,
a. there would be no liquid water on Earth. b. life as we know it would not have developed on Earth. c. it would be a much colder planet. d. there would be no oxygen in Earth's atmosphere. e. All of the above are results of the greenhouse effect.
What was the Ptolemaic model?
A) an Earth-centered model of planetary motion published by Ptolemy B) the Earth-centered model of the cosmos in which the Earth was surrounded by seven perfect spheres, one each for the Sun, Moon, Mercury, Venus, Mars, Jupiter, and Saturn C) a Sun-centered model of planetary motion published by Ptolemy D) the first scientific model to successfully predict solar and lunar eclipses
In design, ______ is the closeness of elements.
A. unity B. balance C. proximity D. contrast
If the hydrogen atom is in an n = 3, ? =2 state, what is a possible value for ? after a photon is emitted?
A) 3 B) 0 C) 4 D) 2 E) 1