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.
No it does not effect the temperature of the earth.
Reindeer were domesticated almost 2000 years ago
B. An oceanic plate sinks beneath another oceanic plate at a convergent boundary
