In the surface energy budget, the term - SW represents
A) heat.
B) incoming energy.
C) surface albedo.
D) NET R.
C
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Before there were modern humans on Earth (i.e., before 200,000 years ago), how many species became extinct each year? Assume there have always been exactly 10 million species.
A. 10/year B. 1/year C. 100/year D. 1000/year
Given that the bond energy of N2 is 946 kJ/mole, the bond energy of O2 is 498 kJ/mole and the NO bond energy is 631 kJ/mole, how much energy is required to react 1 mole of nitrogen molecules according to the following reaction? N2 + O2 ? 2 NO
A) 182 kJ B) -182 kJ C) 813 kJ D) -813 kJ E) 2075 kJ
Entisols have strong horizon development and include among their suborders many of the most agriculturally suitable soils on Earth
Indicate whether the statement is true or false
One difficulty with the process of using hydrogen as a power source is that it ________
A) is less efficient than fossil fuels B) has highly volatile and explosive components C) requires a fuel that is a nonrenewable resource D) first needs to be converted to helium through nuclear fission E) requires a substantial energy investment to produce the fuel