This document provides information about major landforms of the Earth, including mountains, plateaus, and plains. It discusses different types of mountains such as fold mountains, block mountains, and volcanic mountains. Fold mountains like the Himalayas are young with rugged terrain, while older fold mountains like the Appalachians have more rounded features. Block mountains form when large areas break apart vertically. Volcanic mountains form from volcanic activity and have a central vent. Plateaus are elevated flat lands that may have stepped slopes on one or more sides. Plains are large flat areas generally below 200 meters in elevation formed by rivers and tributaries. Humans have settled in different landforms in various ways.