The troposphere acquires most of its energy
content by
a) latent heat transfer.
b) Rayleigh scattering.
c) absorption of terrestrial radiation.
d) positive albedo changes.
c
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Which of the following is true of the Sun?
A) It is a nonluminous body. B) It generates energy by nuclear fission reactions. C) It is about 100 times larger in diameter than Earth. D) It shines by reflecting light from Venus.
Glass in a florist's greenhouse acts as a one-way valve in that it
A) lets light energy flow only in one direction. B) cuts off unwanted radiation. C) allows high-frequency waves in and blocks low-frequency waves exiting. D) is transparent only to lower-frequency waves.
The simplest life forms appeared on Earth when it was how old?
A) five million years B) one billion years C) 2.5 billion years D) 3.5 billion years E) 4.5 billion years
Two charged particles 1 m apart exert a 1-N force on each other. If the particles are instead 0.25-m apart, the force on each particle will be
A) 1.0 N. B) 2.0 N. C) 4.0 N. D) 8.0 N. E) 16.0 N.