Use of the _____ for transportation enabled Arab and African traders to exchange goods along well-traveled caravan routes across the Sahara.
A. horses
B. covered wagons
C. camels
D. elephants
C. camels
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Firewood burns better than granite rocks because
A) firewood has more potential energy. B) firewood has more kinetic energy. C) rocks have more potential energy. D) rocks have more kinetic energy.
Which of the following primary energy sources is currently most consumed by humans?
A) coal B) oil C) natural gas D) nuclear power E) wood
Which region in the continental U.S. has the highest hazard associated with volcanoes and why?
A. Southern California because of the convergent plate boundary there. B. The Pacific northwest because of the convergent plate boundary there. C. The Pacific northwest because of the transform plate boundary there. D. Southern California because of the transform plate boundary there.
We know from the Apollo missions and unmanned probes that the moon's surface is covered with loose, unconsolidated material with a texture similar to soil on earth. How did this material form on the moon?
A) The material is mostly volcanic ash ejected from volcanos that are no longer active. B) The loose material is mostly micrometeorite fragments and ejecta from impact craters, so is very different from soil on Earth. C) The material is produced by spalling from rock surfaces caused by the extreme heat-cold cycles as the moon rotates through a 1 lunar day, or approximately one Earth month. D) The same as Earth, but soils are ancient from a time when the moon still had an atmosphere and water.