Deserts

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Deserts

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Deserts : websites and experiments
http://www.42explore.com/deserts.htm
Deserts
A desert is a region that supports little plant life because of insufficient moisture and dry soil. They are usually (but not always) hot, barren regions that receive little rainfall. Deserts, also called arid regions, characteristically receive less than 10 inches of rainfall per year. Deserts cover about one-fifth of the earth's surface.

Desert Virtual Field Trip
http://www.tramline.com/sci/desert/index.htm
Desert Virtual Field Trip
Deserts generally receive less than 10 inches of precipitation a year, while semiarid regions receive on average between 10 and 20 inches a year. These regions make up about 1/3 of the earth's surface. Deserts are moving all the time due to continental drift and growing mountain ranges. Deserts are found between 15 and 30 degrees north and south of the equator.

Desert Plants
http://www.tlsbooks.com/
Desert Plants

Deserts - Virtual Field Trip
http://www.field-trips.org/sci/desert/index.htm
A field trip created with TourMaker guides you through a sequence of Web pages on any given topic. For each page, there is simultaneous commentary in an accompanying frame. You move forward and back through the Field Trip using the tour Control Panel and you can leave the Tour to explore links and return to it whenever you want.
Deserts generally receive less than 10 inches of precipitation a year, while semiarid regions receive on average between 10 and 20 inches a year. These regions make up about 1/3 of the earth's surface. Deserts are moving all the time due to continental drift and growing mountain ranges. Deserts are found between 15 and 30 degrees north and south of the equator.
Deserts vary in age. The Sahara in northern Africa is 65 million years old and the Kalahari Desert, also in Africa, is much older than that! The Sonoran Desert in North America is a baby by comparison at about 10,000 years old. Due to the extreme heat and dryness (aridity), the desert ecosystem is extremely fragile and efforts are underway to protect these desolate wonders of nature.