Deserts

From Eaglepedia, the free web by TIS toc introduction to desert in a single paragraph what are desert (do this last)

=How desert was formed=

Desert was formed by...
 * 1) **Deforestation** - when trees are cut down, there are no tree roots to hold the soil in place. This means wind erosion can pick up more good topsoil and take it away.
 * 2) Deserts may be caused by **rain shadows**, when mountain ranges prevent clouds from reaching inland. As air from the ocean moves over the mountains, it cools down and moisture condenses, causing **precipitation on the windward side**.
 * 3)  **High altitude** may result in deserts **HOW**
 * 4) Cold deserts, such as the Antarctic, result from the fact that ice and snow does not melt, meaning there is **no opportunity for plants to grow**.

=Weather=

In Sahara desert, the climate is extremely hot and dry. Except in few higher mountain areas, the average annual rainfall nowhere grows 5 inches (130mm). Some areas meat not have no rain for several years and then grows 5 inches or more, once in a while it brief downpour. Next, this is the data of average temperature of desert that I collected in computer. __** Hot and dry desert: **__ __** The normal temperature in desert is 20 to 25° C = (68 - 77 F),but the extreme maximum temperature in desert is from 43.5 to 49° C = (110.3 - 120.2 F), and the coldest temperatures sometimes drop to -18° C = (3.2 F)!! **__

__** Cold desert: **__ __** In the cold desert, the average temperature is between -2 to 4° C = (28.4 - 39.2 F) When it's so hot, temperature is between 21-26° C **__



=Animals=


 * =====__//** Birds **//__===== || =====__//** Mammals **//__===== || =====__//** Reptiles **//__===== || =====__//** Arthropods **//__===== || ======__//** Amphibians **//__====== ||
 * **Road Runner** || **Meerkat** || **Taxes Horned** || **Black Widow** || **Sonoran** ||
 * **Ostrich** || **Caracal** || **Lizard** || **Bark Scorpion** || **Desert Toad** ||
 * **Cactus Wren** and more... || **Pronghorn** and more... || **Texas Banded Gecko** and more... || **Black Widow Spider** and more.. || **Sonoran Desert Toad** and more... ||
 * Plants that lives in desert **

Tree
In Sahara desert the most common trees are date, doum palms olive trees and magara tree. Date palms are useful for the local people. Dates are one of the most exported tree from Sahara. Doum palms are often used for tea, cakes, and sweetmeats. Trees in desert are important, because it helps travelers and villagers, but mostly it helps the travelers. Desert it very hot, so the travelers meat run out of water or food, so when they run out of food if there is a date tree, it will help them keeping their energy.

Grass
The most common type of grass are eragrostis, panicum and aristida. Also known as "love grass," eragrostis is a fast-growing plant that are spreaded around the Sahara desert. Panicum turgidum is a type of grass that can survive through the climate of the desert by growing independently rather than the other types of grass that grows within groups.

Other Plants
Other common plants in Sahara desert are the African welwitchisa, peyote cactus and thyme. The African welwitchisa plant, it survives because of it's long roots. Also the African peyote cactus has thick stem and leaves that allow it to retain water. Without there long roots, the plants wouldn't survive in a hot desert. = = =Endangered species=

While some deserts such as the Sahara are hot and dry, others such as the Atacama are cold,in that desert,there are many animals/plants that survive in the desert, but there are desert animals like the fennec fox, pronghorn and caracal are coming to be endangered species because of hunting encroachment of the human. Almost all of the endangered species are being less because of ...
 * 1) ** Habitat Loss **
 * 2) ** Pollution **
 * 3) ** Competition from another species **
 * 4) ** Disease **
 * 5) ** Predation **
 * 6) ** Hunting/Killing **
 * 7) ** Introduced Species **

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 * Protecting deserts **

work heeds =Biggest desert in the world TOP 10=

The biggest desert in the world is... = = =Eco systems=
 * 1) **Antarctic** **Desert** 13,829,430 KM²
 * 2) **Arctic Desert** 13,726,937 K M²
 * 3) **Sahara Desert (Africa)** 9, 100,000 K M²
 * 4) **Arabian Desert (Asia)** 2,330,000 K M²
 * 5) **Gobi Desert (Asia)** 1,300,000 K M² 10.
 * 6) **Kalahari Desert (Africa)** 900,000 KM²
 * 7)  **Patagonian Desert (South America)** 670,000 K M²
 * 8) **Great Victoria Desert (Australia)** 647,000 K <span style="background-color: #ffffff; color: #333333; font-family: arial,helvetica,clean,sans-serif; line-height: 1.5;">M²
 * 9) <span style="background-color: #ffffff; color: #333333; font-family: arial,helvetica,clean,sans-serif; line-height: 1.5;">**Syrian Desert (Asia/Africa)** 520,000 K <span style="background-color: #ffffff; color: #333333; font-family: arial,helvetica,clean,sans-serif; line-height: 1.5;">M²
 * 10)  **Great Basin Desert (North America)** 492,000 K <span style="background-color: #ffffff; color: #333333; font-family: arial,helvetica,clean,sans-serif; line-height: 1.5;">M²

Networks
A network is a balanced relationship that keeps live together and connected to every other living things. There are two tipes of networks;Symbiotic and Tropic The 3 examples of symbiotic relationships in desert is...... Symbiotic Mutualism:Long-Tonged Bat eats the nectar from many cacti and agave, all while pollinating them as the move from plant to plant. Commensallsm:Gopher Snakes use abandoned rodent holes as their homes. Parasitism:A Flea drinks the blood of a Coyote. Which loses blood and gains discomfort and potentioly disease. Trophic (also known as food web):For example... 1. Insects will be eaten by Tarantula/Scorpion/Lizard and only lizard will be eaten buy Hawk. 2. Rodents will be eaten by snake and snake/lizard will be eaten by fox.

Nested system
A Nested system is a system that shows how smaller systems are part of (made of) larger system, but not connected. The syst em that are closer have more impact to affect each other than system that are farther away. For example, if there was no camel the travelers will have hard time caring their luggage. It will diffidently affect them but it wouldn't make a lot of difference for people who uses machines unlike the people who uses animals.

Cycle
A cycle is an invisible order of events that creates the things nature needs to stay alive. For example,

Flows
A Flow is when life energy goes through an ecosystem and may or may not come back. For example, animals that lives in desert migrate or tr avel to a cooler place before the temperature becomes very high, and leaves the place to find a place that has more water and food. Some birds are active at night to avoid being overheated, they take rests couple of times to keep their energy levels. Some animals and birds that migrate are;
 * ** Northern cardinals **
 * ** Greater roadrunners **
 * ** Blue grosbeaks **

**Development**

Dynamic balance
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See also= work Sahara =Reference=

[|http://en.wikipedia.org/wiki/Sahara_Desert_(ecoregion)]

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[|http://www.brighthub.com/environment/science-environmental/articles/77400.aspx#imgn_0]

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=Links=

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