A metal ring with a gap takes the shape of the letter C. When the ring is cooled, the gap becomes
A. narrower.
B. wider.
C. remains the same size.
D. indeterminate
Answer: A
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In 2000, delegates from 122 countries completed a global treaty to control 12 persistent organic pollutants (POPs) including ____.
A. DDT B. ozone C. chlorofluorocarbons D. methane gas E. mercury
Carbon dioxide concentrations in the atmosphere have been increasing steadily since the beginning of the industrial revolution and may double by the middle of the next century. Why is this of concern?
What will be an ideal response?
Waves that reach shoreline at an angle cause sediment to move along beach in a zigzag pattern called:
a. beach drift b. beach erosion c. wave drift d. rogue wave
Water in the atmosphere turns from a gas into a liquid by the process of ________.
A. evaporation B. respiration C. condensation D. infiltration E. transpiration