What is the main drawback to solar thermal systems?
A. need backup systems at night
B. negative net energy yield
C. high emissions of CO2
D. high methane emissions
Answer: A
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As a region, what is the unifying characteristic of Sub-Saharan Africa?
A) shared language B) unified political system C) similar lifestyles and idea systems D) common religious experience E) similar cultural values
Use the map below to answer this question.
The map illustrates the relative positions of a warm and cold front. Where is the warm front located?
A. Between A and B B. At E C. Between C and D D. Between C and G
If a population of lemmings grows fast during a productive winter and shoots beyond the carrying capacity the population will ________
A) quickly crash back below the carrying capacity B) continue to grow just as quickly C) revert to logistic growth D) continue to grow but in an S shape E) slowly return to below the carrying capacity
Hazardous waste is anything that
A. Is toxic, carcinogenic, mutagenic, corrosive, or explosive B. Causes human health threats C. Has the potential of causing health problems D. Severely contaminates the environment E. All of these are correct