29. CFCs are a problem because they

Question

a. have been released in large quantities in the past
b. break down to reactive free chlorine atoms
c. attack ozone molecules in the upper atmosphere
d. all of the above
D?

10. Ozone depletion in the atmosphere
a. leads to the formation of acid precipitation
b. leads to a rise in chlorofluorocarbons
c. allows more harmful radiation from the sun to reach the earth
d. both b and c
D?

Thanks
-MC

Answer 1

29. OK
10. http://library.thinkquest.org/26026/Environmental_Problems/ozone_depletion_-_effects.html

Answer 2

So 10 is just C?

-MC

Answer 3

Si, C

Answer 4

Gracias!

PS>Why were we blocked yesterday?

Thanks!
-MC

Answer 5

I don't know anything about that.