The greenhouse effect produces excess heat in a planet's atmosphere by
a. trapping infrared radiation from escaping into space.
b. clouds blocking the surface from receiving any infrared radiation.
c. trapping light gases from escaping into space.
d. trapping ultraviolet light in the upper atmosphere of the planet.
A
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The period-luminosity law of pulsating variable stars indicates that
A. the period of pulsation is independent of luminosity. B. the more slowly a star pulsates, the more luminous it is. C. the faster a star pulsates, the more luminous it is. D. None of these choices is correct.
Most Asteroids are found in the asteroid belt, which lies between the orbits of ________.
A. Earth and Mars B. Mars and Jupiter C. Venus and Earth D. Neptune and Pluto E. Saturn and Jupiter
There is an immediate need to develop strategies aimed at stopping world population growth
What will be an ideal response?
In an experiment, the experimental group is:
a. not subjected to experimental error b. not exposed to experimental treatments c. maintained under strict laboratory conditions d. treated exactly the same as the control group, except for one independent variable e. statistically the most important part of the experiment