Desert

http://www.cotf.edu/ete/modules/msese/earthsysflr/desert.html

http://inchinapinch.com/hab_pgs/terres/desert/desert.htm

http://mbgnet.mobot.org/sets/desert/index.htm

http://www.panda.org/news_facts/education/virtual_wildlife/wild_places/deserts.cfm

http://www.desertusa.com/desert.html

http://earthobservatory.nasa.gov/Laboratory/Biome/biodesert.html

http://www.blueplanetbiomes.org/desert.htm

http://www.nceas.ucsb.edu/nceas-web/kids/biomes/desert.htm

http://www.zoomwhales.com/biomes/desert/desert.shtml

Grassland

http://mbgnet.mobot.org/sets/grasslnd/

http://www.summitelgin.org/grassland_web/Temperate%20Grasslands/Introduction.htm

http://www.panda.org/news_facts/education/virtual_wildlife/wild_places/grasslands.cfm

http://earthobservatory.nasa.gov/Laboratory/Biome/biograssland.html

http://www.blueplanetbiomes.org/prairie.htm  

http://www.nceas.ucsb.edu/nceas-web/kids/biomes/grassland.htm

http://www.zoomwhales.com/biomes/grassland/grassland.shtml