The answer is the second one: Many Mongolians are pastoral nomads who raise livestock for a living.
In the tropic savannas, a variety of vegetation and grass prairies grow. The dominant plant types are the Grasses, in the savanna. A wide variety of grasses grow in savannas but may vary in different savannas. Some grasses grow 6 to 9 feet tall.
The main type of energy is oil and natural gas
Gulf coastal plains, Interior Lowlands, The Great Plains, and the Basin & Range
Hope this helped (:
Frost action or frost shattering?