This document discusses the major terrestrial biomes of the world. It defines biomes as large ecosystems characterized by climate and organisms adapted to that climate. The major biomes discussed include tropical rainforest, tropical dry forest, tropical savannah, desert, temperate grasslands, temperate woodlands/shrublands, temperate forest, northwestern coniferous forest, boreal forest/taiga, and tundra. For each biome, the document lists characteristics to research such as temperature, precipitation, soil type, common plants, animals, human impacts, and other interesting facts. Additional ecosystems described briefly are mountain ranges and polar ice caps.