The Columbian Exchange was a transfer of people, goods, and ideas between .

1.the Eastern and Western hemispheres

2.Asia and the Americas

3.the Northern and Southern hemispheres

4.Africa and the Americas

Which of these belongs to the united states after the spanish american war ?

During the cold war, which of the following groups of countries would have all been"behind the iron curtain"

What do most climatologists see as a major cause of rising global temperatures? a. earth's closer proximity to the sun due to its gravitational pull b. greenhouse gases produced by burning fossil fuels c. rising ocean levels caused by melting polar ice sheets d. water pollution cause by industrial waste