Which of the following statement about ozone is correct?
A. it is essential for breathing
B. it absorbs ultraviolet rays
C. its proportion in air is about 3%
D. it is mainly responsible for global warming
Answer:D
Which of the following statement about ozone is correct?
A. it is essential for breathing B. it absorbs ultraviolet rays C. its proportion in air is about 3% D. it is mainly responsible for global warming