Which of the following new renewable energy sources has grown faster than the overall energy supply in the last four decades?
a. Geothermal
b. Solar
c. Wind
d. All of the above.
Answer: D
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The economic concepts of supply and demand represent which of Ullman's three essential conditions for spatial interaction?
A. complementarity B. intervening opportunities C. transferability D. none of these
High oxygen content in water is an indication that
A. Sewage, paper pulp, or food processing wastes have been added to the water B. There are no contaminants present at all C. There is a large population of coliform bacteria D. Water is only able to support algae and bacteria E. Water is clean enough to support game fish
Whirlpools can be created in some restricted shallow passages due to ________
A) a vertically mixed estuary B) reversing tidal currents C) tidal bores up low-lying rivers D) tsunamis or tidal waves E) wave refraction
Which of the following is not part of Earth's climate system?
A) Exosphere B) Atmosphere C) Hydrosphere D) Biosphere E) Geosphere