The sky is blue because
A) molecules scatter blue light more effectively than red light.
B) molecules scatter red light more effectively than blue light.
C) the Sun mainly emits blue light.
D) the atmosphere transmits mostly blue light.
E) the atmosphere absorbs mostly blue light.
Question 2
How is the sunspot cycle directly relevant to us here on Earth?
A) The sunspot cycle strongly influences Earth's weather.
B) The Sun's magnetic field, which plays a major role in the sunspot cycle, affects compass needles that we use on Earth.
C) The brightening and darkening of the Sun that occurs during the sunspot cycle affects plant photosynthesis here on Earth.
D) Coronal mass ejections and other activity associated with the sunspot cycle can disrupt radio communications and knock out sensitive electronic equipment.
E) The sunspot cycle is the cause of global warming.
Separation of molecules by gel electrophoresis
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