Carbon dioxide is added to the atmosphere by human activities. When hydrocarbon fuels (wood, coal, natural gas, gasoline, and oil) are burned, carbon dioxide is released.
First of all, this isn't Geography. Second of all, look around Brainly for the answer before you post a question, because it has been answered over 10 times now...
Answer:
The third one is the right one it was on my AP PRE EXAM
Explanation:
If this is a true or false question, the answer is false. United States do share land borders with Mexico as well as Canada along with Russia, Bahamas and Cuba. United States then is north of Canada and south of Mexico. Hope this is the answer.