What is the principal reason that iron and steel are recycled at such a high rate?
A) Iron and steel are highly valuable on the precious metals market.
B) The market for steel is large and widespread.
C) All sources of iron ore have been more or less exhausted.
D) Environmental regulations mandated iron and steel recycling starting in the 1950s.
B
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Intense sunlight causes a band of hot, rising air laden with evaporated water near the equator. This moisture then falls because
A. Moisture is condensed as convection currents carry air over hotter, drier regions B. Its potential energy increases with height C. The moisture evaporates as convection currents carry air over hotter, drier regions D. The rising air cools and loses its ability to hold water vapor E. Warm air cannot hold much moisture
Benthic plants that live on the seafloor are called __________ and benthic animals that live on
the seafloor are called __________. Fill in the blank(s) with the appropriate word(s).
Why might a small piece of chalk made of calcium carbonate be useful for alleviating acid indigestion?
A) Calcium carbonate is a base that reacts to neutralize any excess acids. B) Calcium carbonate is able to absorb excess acid and carry it out of the system. C) Calcium carbonate is able to add an extra lining to the stomach to protect it from the excess acid. D) Calcium carbonate is able to turn the acid into a gas which can relieve the build-up of excess acid.
Residence times are dependent upon steady-state conditions and a well-mixed ocean
a. True b. False