Active Solar Heating Requires a ___ Between the Black Material

Q13: What percent of the energy from burning

Q14: The country with the greatest availability of

Q15: Worldwide, the leader using wind power is<br>A)China<br>B)Germany<br>C)Spain<br>D)US

Q16: The elemental gas hydrogen is abundant in

Q17: Advantages of wind power are<br>A)high net energy

Q19: Plug-in hybrid vehicles may require the burning

Q20: The major user of solar hot water

Q21: Solar power requires backup systems for<br>A)windy days<br>B)cold

Q22: Akron, Ohio, which averages 201 cloudy days

Q23: As a general rule, winter thermostat settings