One difficulty with the process of using hydrogen as a power source is that it ________
A) requires a substantial energy investment to begin the process
B) is toxic to humans and wildlife
C) requires a fuel that is a nonrenewable resource
D) is less efficient than fossil fuels
E) has highly volatile and explosive components
A
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By the ____________________, evaporite deposition had ended in the Gulf Coast region of North America and
normal marine sedimentation had begun. Fill in the blank(s) with the appropriate word(s).
What comprises the most abundant form of matter in the universe?
A) water molecules B) planets and planet-like bodies C) dust and debris D) hydrogen and helium
Which of the following has the highest albedo?
A) Forests B) Dry, light sandy soils C) Fresh snow D) Asphalt
Tropical, subtropical hot steppe climates experience seasons characterized by dry summers and somewhat wetter winters brought about by the shifting of the subtropical high
Indicate whether the statement is true or false