The Tropical grassland biome, such as the African savanna, lie mostly between the tropics of Cancer (23.4 degrees North) and Capricorn (23.4 degrees South). Tropical grasslands are a transition...
Dry grasslands such as the prairies and savanna are marked by a limited or seasonal rainfall, which is one factor for the lack of trees (which may still predominate along existing streams and...
The difference is that deserts are more dry and have less rainfall than a savanna. The savanna has clumps of trees while the desert usually can not support much plant life.