The savanna is a type of tropical biome with large stretches of grasslands mixed with sparse trees and shrubs. It is an intermediate terrain between tropical forest and desert.Not enough rain falls to support a forest biome. Climatic savannas is the term for savannas that are the result of climate conditions. Edaphic savannas are caused by soil conditions, and derived savannas are the result of forest clearing by humans.t is an intermediate terrain between tropical forest and desert. Not enough rain falls to support a forest biome. Climatic savannas is the term for savannas that are the result of climate conditions. Edaphic savannas are caused by soil conditions, and derived savannas are the result of forest clearing by humans.