With immediate and sustained action to stop production of all ozone-depleting chemicals:
a. The ozone-hole problem will be solved immediately.
b. It will take about 5 years for the earth's ozone layer to recover to 1980 levels.
c. It will take about 30 years for the earth's ozone layer to recover to pre-1950 levels.
d. It will take about 60 years for the earth's ozone layer to recover to pre-1950 levels.
e. It will take about 60 years for the earth's ozone layer to recover to 1980 levels.
E
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In the United States, enough ____________________ are used each year so that, if linked end to end, they would reach to the moon and back seven times
Fill in the blanks with correct word
The ________ is the upper part of the Sun's atmosphere
Fill in the blank(s) with the appropriate word(s).
The current distribution of soccer demonstrates that
A) a folk custom can become part of a popular culture. B) all sports are examples of folk culture. C) television has infused all sports into popular culture. D) American football is also an example of a folk culture. E) sport is more important in less developed countries.
Charge separation in clouds
A) requires collisions between ice particles and either snowflakes or graupel. B) is part of the collision-coalescence precipitation-formation process. C) is caused by the voltage difference between the ground and the tropopause. D) is most common in altocumulus clouds. E) is usually horizontal, not vertical.