Hydrogen fuel cells
A. rely on direct energy from the sun.
B. use geothermal energy to produce electricity.
C. combine hydrogen and oxygen gas to produce electricity and water vapor.
D. require complex carbohydrates as starting materials.
E. break apart water molecules and use the hydrogen as energy.
Answer: C
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When any electrical device in a vehicle is turned on (such as an air conditioner), a greater amount of fuel is consumed by the engine. This statement is
A. always false. B. sometimes true, sometimes false. C. true. D. true only if the engine is running.
Giant internal waves can move down the side of submerged mountains and are detected by
temperature differences between water layers. Indicate whether the statement is true or false.
On surface charts, adjusting surface pressure to sea-level pressure eliminates the effects of:
a. variations in ridges and troughs b. variations in elevation. c. variations in temperature. d. variations in pressure gradients.
Volumetrically, the greatest production of new volcanic rock occurs at seafloor spreading ridges.
Answer the following statement true (T) or false (F)