There is an immediate need to develop strategies aimed at stopping world population growth
What will be an ideal response?
It would seem to be the case that we are near the ultimate limit to the number of
people that can live on the planet. See the estimates in the chapter; many are around the
present population. The greatest is some 80 billion, fewer than four doubling times from
now.
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When two tectonic plates collide
A) they both stop moving. B) they always produce high mountain chains like the Himalayas. C) volcanoes always mark the boundary between them. D) they continue moving, producing a variety of large deformations. E) that region is safe from earthquakes now the plates are fixed.
For a longitudinal mechanical wave, the particle motion is
a. parallel to the direction of the wave velocity. b. perpendicular to the direction of the wave velocity. c. both parallel and perpendicular to the direction of the wave velocity. d. in all directions.
The stratosphere and the troposphere account for ______________ of the mass of the atmosphere
a. 80% b. 90% c. 99.9% d. 78.1%
The intensity of a sunspot is found to be 3 times smaller than the intensity emitted by the solar surface. What is the approximate temperature of this sunspot if the temperature of the solar surface is 5800 K?
a. 4400 K b. 470,000 K c. 1900 K d. 7600 K e. 1400 K