Grupa+2

code Die Kontinente der Erde machen insgesamt 29,3 Prozent der Erdoberflache aus Gebirge 24 prozent vom land Wuste 20 prozent vom land Glaciers cover roughly 10 percent of Earth's land area. forets 4 billion hectares, or 30 percent of the world's land surface. Rainforests once covered 14% of the earth's land surface; The percentages of earth's land surface can be divided into different types: 20% covered by snow land, 20% mountains, 20% dry land, 30% good land that can be farmed, 10% land doesn't have topsoil.

http://hypertextbook.com/facts/2001/DanielChen.shtml en.wikipedia.org/wiki/Deforestation http://www.apeuk.org/content/carbon-and-biosphere-herbert-girardet http://factsanddetails.com/world.php?itemid=1189&catid=52&subcatid=331 http://www.scienceclarified.com/landforms/Faults-to-Mountains/Glacial-Landforms-and-Features.html www.mountainpartnership.org/files/pdf/leaflet/ENG-LR.pdf http://www.pewenvironment.org/campaigns/global-ocean-legacy/id/8589941025/ http://wiki.answers.com/Q/What_percentage_of_land_on_the_earth%27s_surface_is_inhospitable_lands http://www.scienceclarified.com/scitech/Global-Warming/Signs-of-a-Warming-Planet.html http://www.windows2universe.org/kids_space/qearth_int.html

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