Why would a decrease in the density of the ozone layer create a public health concern?
a. The greenhouse effect would not be as efficient and the temperature of Earth would decrease.
b. The greenhouse effect would be more efficient and the temperature of Earth would increase.
c. Plant life would no longer have the ozone it needs for photosynthesis to create chlorophyll.
d. Ultraviolet radiation from the Sun would bombard Earth.
e. none of the above
d
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The uppermost layer of the Earth's surface containing mineral and organic matter capable of supporting plants is
What will be an ideal response?
What is the photoelectric effect?
a. The mechanism by which a camera works. b. The effect seen by bombarding a metal surface with an electron beam. c. The production of light by an electric discharge through a gas. d. The emission of electrons from a clean metal surface when light shines on the surface. e. The fact that electrons bounce off any surface when light shines on it.
The angular momentum of an isolated object can be changed only by
A. applying a torque. B. changing its rotational inertia. C. applying a force along the axis of rotation.
Ammonia, NImage, is more polar than is borane, BImage because it
A) has a lone pair of electrons. B) is less symmetrical than borane. C) its hydrogens are not exactly opposite one another. D) all of the above