Which statement is a common misconception with regard to Earth's atmosphere?
a. The carbon dioxide added to the atmosphere since the year 1800 is mostly or entirely due to human burning of fossil fuels.
b. All of Earth will warm at the same rate if there is global warming.
c. The ozone layer in the upper atmosphere protects the lower atmosphere and Earth's surface from harmful solar UV radiation.
d. Global warming and ozone depletion are two very different activities in Earth's atmosphere.
e. Earth has experienced a greenhouse effect its entire planetary history.
Question 2
Brown dwarfs are ____.
a. stars with a very thick dust sphere around them, so they appear brown
b. low mass M type stars with hundreds of planets
c. an anomaly because they are extremely small but have relatively high temperature
d. protostars that could not ignite the fusion of hydrogen at their core
e. has a surface temperature of 2500 K by fusing hydrogen
