Similarly, mass migrations may take place in the form of deportation, such as deportations in the Neo-Assyrian Empire, imprisonment in Nazi concentration camps during World War II, deportations to Gulag camps in the Soviet Union, and coolie labour in Southeast Asia and the Caribbean.
Gravity causes mass movement. Types of mass movement: landslides, mudslides, slump, and creep. The most destructive kind of mass movement is a landslide, which occurs when rock and soil slide quickly down a steep slope.
