Tropical rainforest are places with heavy precipitation loads, along high primary productivity, high arboreal density and high temperatures. They are around the tropics, from the earth's equator to the Cancer and Capricorn's tropics. On the other hand, Tundra is a cold, dry biome. With very low productivity and few plant density. It is located in the northern latitudes, just before the arctic. Tundra's distribution is ring-like, around the North Pole.
