The greenhouse effect is the rise in temperature that the Earth experiences because certain gases in the atmosphere (water vapor, carbon dioxide, nitrous oxide, and methane, for example) trap energy from the sun. Normal warming is mostly caused by natural gases.
The Andes Mountains, Central Valley, Atacama Desert, and the Archipalagos. Hope this helps!!
Different perceptions of a region can make that region less defined is true im not a 100% sure tho
The area In Latin America that is actually common wealth of the United States is puerto rico