The document summarizes the key characteristics of tropical rain forests. It notes that tropical rain forests are located near the equator in areas with high temperatures and rainfall throughout the year. They contain high levels of biodiversity and many tree species, though soils are low in nutrients. Tropical rain forests are under increasing pressure from logging, agriculture, and development which can permanently degrade the forests and convert them to grasslands. The document also provides brief overviews of tropical seasonal forests and savannas.