Question

1. At which time of day is the heat flow entering Earth's atmosphere (Hin) highest?
A. Sunrise
B. Midday
C. Sunset
D. Midnight

2. Which of the following events could increase Earth's temperature?
A. a decrease in the relative percent of greenhouse gases
B. planting more trees
C. widespread removal of tropical forests
D. a reduction in the use of fossil fuels

3. When the levels of greenhouse gases in Earth's atmosphere increase, which statement is true?
A. Earth's temperature increases because Hin increases.
B. Earth's temperature increases because Hout increases.
C. Ear