What are Mexico's four culture regions? Describe a feature about each of them. added!! Please help, and don't just answer to get the fucking points- ^-^ - ~ thanks ~

Nuclear experimentation is a major global issue that affects relationships between countries. describe why countries try to limit the testing of nuclear weapons.

What are the answers for the following questions?

You have been tasked with sorting the rock samples shown into three categories, with two rocks in each category. what attribute would you use to sort these rocks? which rocks would be in each category? rocks: obsidian, coquina limestone, granite, soapstone,pumice, and gneiss.