Which of the following currently has the highest energy returned on investment (EROI)?
A) petroleum
B) nuclear fusion
C) hydropower
D) corn-based ethanol
E) nuclear fission
Answer: C
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A continental craton is best described as
A) the inactive remains of ancient tectonic activity. B) the product of active folding and faulting. C) the surface accumulation of molten rock. D) a landform undergoing constant tectonic activity.
The general chemical equation for photosynthesis is shown below. Through this reaction is the carbon oxidized or reduced? How can you tell? 6 CO2 + 6H2O ? C6H12O6 + 6 O2
A) Oxidized, since carbon is in the +4 oxidation state in but in the +6 oxidation state in the product, C6H12O6, glucose. B) Reduced, since in carbon dioxide there are two oxygen atoms for every one carbon but within the product, C6H12O6, (glucose), there is only one oxygen for every one carbon. C) Neither, since carbon does not change its oxidation state and is neither oxidized nor reduced. D) Both, since the carbon atoms within the glucose molecules display two different charge states.
Which condition would be described as the most stable?
a. environmental lapse rate is 13°C per kilometer b. environmental lapse rate is 3°C per kilometer c. isothermal conditions d. an inversion e. superadiabatic conditions
The evidence for the geologic history of plate motions on Earth prior to about 180 million years ago comes entirely from evidence found on continents and not from rocks found in the oceans. Explain why this evidence is restricted to continents
What will be an ideal response?