Global temperature variations on Earth driven by the Milankovitch cycle differ from those driven by the anthropogenic greenhouse effect in that
a. they are very small in magnitude, less than 1°C.
b. they occur at irregular time intervals.
c. they are driven by volcanic activity.
d. they occur over much longer time scales (thousands of years).
e. they are driven by emissions of methane gas rather than carbon dioxide.
d. they occur over much longer time scales (thousands of years).
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The sunspot cycle is sometimes described as lasting 11 years, but others prefer to consider it as 22 years; explain the rationale
What will be an ideal response?
To estimate the central temperature of the Sun, scientists
A) create a version of the Sun in a laboratory. B) use computer models to predict interior conditions. C) send probes to measure the temperature. D) monitor changes in Earth's atmosphere.
Theoretical physicists have had the greatest success in combining which force with the electromagnetic force?
a. strong nuclear force b. weak nuclear force c. gravitational force d. the force caused by the exchange of gluons
A nearsighted person has a far point that is 4.2 m from his eyes. What focal length lenses must he use in his contact lenses to allow him to focus on very distant mountains?
A) -4.8 m B) -5.2 m C) 4.2 m D) -4.2 m E) 5.2 m