On which of the following days can there be 12 hours

 On which of the following days can there be 12 hours of daylight and 12 hours of
darkness everywhere on Earth?
 Which of the following is incorrect?

 In this figure, the sun radiates most of its energy in which portion of the electromagnetic
 Based on the figure, explain why polar regions are cooler than tropical regions because: 
 Explain why air temp through most of the stratosphere increases with altitude:
 Which of following is true of the ionosphere?  Molecules mostly responsible for stratospheric ozone depletion: Chlorofluorocarbons.
 The UV Index
-is a measure of the amount of visible radiation coming from the sun.
-is a measure of the surface temperature of earth.
-forecasts the risk of overexposure to sunlight.  Correct
-is partially determined by wind speed.
 Most of Earth’s Weather occurs in:
 Stratospheric Ocean loss is a cause for concern because ozone: