Which characteristic of Earth explains why we have an ultraviolet-absorbing stratosphere?
A. the existence of photosynthetic life
B. the existence of plate tectonics
C. the moderate surface temperature
D. the existence of oceans
Answer:A
Which characteristic of Earth explains why we have an ultraviolet-absorbing stratosphere?
A. the existence of photosynthetic life B. the existence of plate tectonics C. the moderate surface temperature D. the existence of oceans