<span>When applied to earth’s atmosphere, the greenhouse effect is related to the "Amount of Carbon dioxide in the Atmosphere"
Hope this helps!</span>
A a landform that is naturally lower than its surroundings
I think this would be the Great Wall of China!
although it's actually thought to be much, much longer: over 5000 miles long, if yoiu include natural defensive barriers used in it.
Your answer would be C
pesticides can pollute ground water
