The second one is push factors, the first one is pull factor, the fourth one is forced migration, and the third one is chain migration, hope this helps.
Volcanic eruptions and/or earthquakes caused by the shifting of tectonic plates
This question. Is making a question out of a sentence. Here is a graph of the global temps over the millennia.
-South Africa richest country in minerals
-Oil: Nigeria, Angola, Equatorial Guinea, Gabon
-Diamonds: Botswana, DR of Congo, Republic of South Africa, Namibia
-Uranium: Namibia, Niger, Malawi, Republic of South Africa
-Strategic minerals: Republic of South Africa, DR of Congo, Rwanda
-Copper: Zambia, DR of Congo, Republic of South Africa