The dumped sediment from a stream flowing into standing water is called a
A) delta.
B) floodplain.
C) drainage basin.
D) divide.
Answer: A
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Most glasses and some minerals exhibit a type of fracture characterized by nested and curved crack surfaces. What term describes this property?
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Which of the following is not consistent with recent observations of the cosmic microwave background by Planckt?
A) The universe is geometrically "flat" (in the four dimensions of spacetime). B) The matter density (both luminous and dark matter combined) in the universe is only about one-fourth of the critical density. C) Dark energy, whatever it is, represents the majority of the energy content of the universe. D) The universe is at least 20 billion years old.
Spherical mirrors suffer from
A) both spherical and chromatic aberration. B) spherical aberration, but not chromatic aberration. C) chromatic aberration, but not spherical aberration. D) neither spherical nor chromatic aberration.
Suppose that hydrogen, rather than iron, had the lowest mass per nuclear particle. Which of the following would be true?
A) Stars would be brighter. B) Stars would be less massive. C) All stars would be red giants. D) Nuclear fusion could not power stars.