The Himalayan Mountains are rugged, jagged peaks and the Appalachians are smooth and rolling. Why is there a difference?
a. The Himalayas are much older and the rocks have begun breaking off.
b. The Himalayas are volcanic mountains and the Appalachians are not.
c. The Appalachians are much older and have been smoothed by erosion.
d. The Appalachians are younger and just started to be thrust upward by plate tectonics.
e. a and d
C
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Indicate whether the statement is true or false
Planetary transits of exoplanets are rare because
A) most stars are too bright for us to detect a planetary transit. B) the Earth's atmosphere interferes with our observations of transits. C) our telescopes are not powerful enough to detect them. D) most extrasolar systems are not seen edge-on. E) most exoplanets are smaller than Pluto.
The Bohr model of the atom is akin to a
A) miniature solar system. B) blob of plum pudding, where raisins represent electrons. C) central heavy ball with lighter balls connected by springs. D) all of the above
Which of the following best describes what we mean by a habitable world?
A) a planet or moon that could support life, if any life happened to be on it B) a planet or moon with life C) a planet or moon that lies within its star's habitable zone D) a planet or moon on which humans could survive if we happened to go there