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Biomes of the world. Tundra, desert, grasslands and forest.

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Introduction

Arctic Tundra * The Arctic tundra is a cold, vast, treeless area of low, swampy plains in the far north around the Arctic Ocean. * This is the earth's coldest biome. * The sun does not rise over for nearly six months of the year, so winter temperatures can be below -30�F in winter. * A permanently frozen subsoil, called permafrost, which makes it impossible for trees to grow. * Frozen prehistoric animal remains have been found preserved in the permafrost. Coniferous Forest * The coniferous forest biome is south of the Arctic tundra. It stretches from Alaska straight across North America to the Atlantic Ocean and across Eurasia. * The largest stretch of coniferous forest in the world, circling the earth in the Northern Hemisphere, is called the "taiga." ...read more.

Middle

* It is a lively place, where oak, beech, ash, and maple trees are typical, and wildflowers, berries, and many types of insect and animal life are found. Desert * A desert is an area where little or no life exists because of a lack of water. * About one-fifth of the earth's land surface is desert. * Deserts can be found on every continent except Europe. * There are two different kinds: 1. Hot and dry (such as the Arabian and Sahara deserts) 2. Cold and dry (such as Antarctica and the Gobi desert). * The lack of water and intense heat or cold make this biome inhospitable to most life forms. * A few animals,mainly reptiles, are well adapted to the hot desert. ...read more.

Conclusion

* The other major belt, called the Alpine-Himalayan, or Tethyan, system, stretches from the Pyrenees in Spain and France through the Alps and on to the Himalayas before ending in Indonesia. * A mountain biome is very cold and windy. * There is also less oxygen at high altitudes. Rainforests * Tropical rainforests are found in Asia, Africa, South America, Central America, and on many of the Pacific islands. * They are often found along the equator. * Tropical rainforests receive at least 70 inches of rain each year and have more species of plants and animals than any other biome. * The combination of heat and moisture makes this biome the perfect environment for more than 15 million plants and animals. * A rainforest grows in three levels; 1. The canopy 2. The understory 3. The forest floor * Rainforests are an endangered biome. ...read more.

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