1. What?
   1. Where?
      1. 23.5º N
         1. Tropic of Cancer
      2. 23.5º S
         1. Tropic of Capricorn
   2. Species
      1. Greatest diversity
         1. 50% of world's
            1. plant
            2. animals
2. Climate
   1. 20º-25º average
      1. Varies little
   2. 12 hours of sun
   3. rainfall
      1. large
         1. 2000-6000 mm
      2. evenly distributed
   4. humidity
      1. 77% - 88%
3. Soils
   1. Names
      1. Latosols
         1. rapid weathering
         2. leaching
      2. Laterite
         1. red soil
   2. minerals
      1. washed away
         1. most
         2. by
            1. acid rain
            2. leaching
      2. iron oxide
         1. rusts
         2. red tint
            1. tropical red soil
      3. aluminium
   3. humus
      1. poor
         1. why?
            1. plants
            2. fast growing
            3. consume
            4. nutrients
      2. lots produced
         1. insects
         2. bacteria
         3. fungi