The spectra of most stars are dark-line spectra because ________
A) elements in the Sun's outer atmosphere absorb in these dark-line bands, blocking the radiation in those bands
B) electrons decaying to a lower energy state emit a photon at a fixed energy, leaving dark bands between the emissions
C) elements in the Sun's outer atmosphere emit radiation between these dark bands
D) elements in the earth's atmosphere absorb in these dark-line bands, blocking out the frequencies in the dark bands
A
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Pesticides have a positive benefit in terms of public health because fungi, insects, and noncrop plants can contaminate crops with many natural toxins
Indicate whether the statement is true or false
Just east of the 98th meridian in the United States:
From Table 29.1, the biome map, and the climate map, determine the terrestrial biome that best characterizes each of the following descriptions and write its name on the first line provided. On the second line, relate it to temperature and precipitation regimes and/or global pressure and wind belts outlined at the end of Section 1.
In urban areas,
A) changes in surface type modifies the energy balance. B) changes in surface type negates the energy balance. C) changes in surface type generally causes daytime cooling. D) changes in surface type have little effect on meteorological conditions.
The greenhouse effect refers to
A. a natural phenomenon that keeps the earth's atmosphere warm. B. albedo. C. environmental change. D. the gradual warming of the earth due to anthropogenic causes.