What is a map key ? what does a map key do?

According to the united nations refugee agency, more than 2/3 of the world's refugees come from just five countries. which country is not on that list? a) turkey b) myanmar c) afghanistan d) south sudan

Which country's action would be in violation of section ii of the agenda 21 plan

Dose local topography and sea surface temp contribute to differences in climate between baeious localities