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+DDG summary:
+aquatic -> freshwater / marine,
+grassland (2nd largest?),
+forest -> tropical / temperate,
+desert,
+tundra,
+
+---
+
+Wikipedia:
+ice sheet / polar desert,
+tundra (tree growth hindered by cold and short growing seasons; arctic, alpine, antarctic; shrubs, grasses, mosses, lichen; soil high N & P, biomass, methane, CO2, permafrost),
+taiga (boreal forest, snow forest, coniferous forest; pines, spruces, larches; largest land biome),
+temperate broadleaf forest,
+temperate steppe and savanna,
+subtropical evergreen forest,
+Mediterranean vegetation,
+monsoon forests and mosaic,
+arid desert,
+xeric shrubland,
+dry steppe and thorn forest,
+semiarid desert,
+grass savanna,
+tree savanna,
+dry forest and woodland savanna,
+tropical rainforest (evergreen?),
+alpine tundra,
+montane forests and grasslands,
+
+alts:
+deciduous forest (not evergreen - can be cold or dry to cause leaves to fall; trees, shrubs, perennials),
+high plateaus (flat raised plains),
+
+---
+
+savanna seems to just mean grassland with some shrubs and trees? (dry)
+steppe is grasslands with NO trees (dry, often cold)
+meadow is wet grasslands
+hypoxic / anoxic waters FROM dead zones (nutrient concentration -> bloom, low water movement, high temperature; deepest waters?), gyre centers (ocean currents)
+
+("continentalness" may be useful)
+
+tropical just means low latitude - these are small
+montane just means mountain
+
+(one mm of rainfall == 1 L/m^3)