Earth's atmosphere is able to gradually refract light rays:
A) only when it is very dry.
B) only when the sun is very high in the sky.
C) because of the changing density of air as you get closer to the surface.
D) because of air pollution that is present.
Question 2
Which of the following is not cited as a factor in helping to reduce air pollution?
A) use of more alternative, clean energy sources such as wind and solar
B) increased vehicle fuel-efficiency
C) uses of alternative and public transportation
D) stricter air emission regulations
E) increased use of coal as an energy source
How a photosystem harvests light.
The Atmosphere of Mars
The frontal sinus, an airfilled space just behind the brow, is a unique size and shape in each of us
Earth
Earth’s orientation
In the retina, there are two types of light receptor cells: Rods are sensitive to differences in lig