Life on Land. Chapter 2. Terrestrial Biomes. Biomes are distinguished primarily by their predominant plants and are associated with particular climates. Geographic and seasonal variations in temperature and precipitation are fundamental components.
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Vernal equinox Mar 22nd
Summer solstice June 22nd
Autumn equinox Sept 22nd
Seasons due to tilt of the Earth and its annual orbit around the Sun.
Midlatitude grasslands receiving 0.3 to 1.0 m rainfall per year, falling mostly during summers.
Coniferous or deciduous forests of 40º to 50º latitude with precipitation of 0.65 to 3.0 m per year, with more precipitation in winter than at temperate grasslands.
Northern forest south of the arctic tundra, mostly containing conifers (spuce) and some aspen and birch.
Northern most biome dominated by mosses, lichens, and dwarfed willows and birch, low to moderate precipitation and very short growing season.