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The Sahara Desert
Ali Fazelon 24 November 2013
Transcript of The Sahara Desert
Sneak Peak Into Weathering
The Sahara dessert covers the whole of the Northern African region.Area: 9,400,000 km². It is found (latitude) 15-35 degrees north and south of the equator. This is where deserts are most commonly found.
The Sahara desert is very arid (dry) the annual rainfall in the Sahara is below 2.5 cm (25 mm) per year. In addition to being extremely dry, the Sahara is also one of the hottest regions in the world. The average annual temperature for the desert is 30°C but during the hottest months temperatures can exceed 50°C, with the highest temperature ever recorded at 58°C in Aziziyah, Libya.
WHY IS THE SAHARA DESERT WHERE IT IS?
1. They avoid hot daytime temperatures by hiding underground, in rodent burrows.
2. During sandstorms the snakes can swirl underground into the desert sand.
3. Some rattle snakes are camouflaged.
WHY IS THE SAHARA DESERT SO HOT?
Weathering: the breaking up of rocks in the place they are found, weathering is carried out by the weather, plants, animals, and chemicals.
When rocks are chemically weathered they break down into the minerals from which they were made. in deserts the chemical weathering processes are salt crystallization and hydration.
The graph shows the average amount of rainfall and average temperature in the Sahara monthly.
Winds around the equator are very warm, this causes winds to rise, these winds form clouds. When these winds rise they go up 12 miles, this latitude is known as the troposphere. Because the wind is rising it cools down and once it reaches the troposphere it cools down, at this point the winds split, 30 degrees north and 30 degrees south of the equator. 30 degrees north of the equator is where the Sahara lays. at this point the air is cool and so it falls, as it falls it acquires dryness, these winds cause the Sahara desert.
There are a number of plants and animals in the Sahara. Below are some and how they have adapted to their environment:
1. The thick waxy skin to reduce loss of water.
2. The large fleshy stems to store water.
3. the spikes to stop animals from stealing stored water.
4. Long shallow roots which spread over a wide area.
1. Long eyelashes to protect from sand.
2. Thick eyebrows which stand out and
shade eyes from the sun.
3. Wide feet so they don’t sink in the
4. They can go without water for
over a week because they can drink
gallons in one go.
1. Living underground to keep them out of the heat.
2. Eating dung which would be an easy food source to find.
In the figure below ray B has a shorter distance to travel before it his the earth, when it does, it hits a small surface, which make the rays very intense, this surface is the equator. The intense rays cause the deserts. Ray A has a very long distance before hitting earth, this way it looses its heat intensity, because the earth is round Ray A has a larger surface of land to cover, Ray A hits areas like the poles and Ray B hits areas like the Sahara
Sahara desert is the second largest desert in the world, after Antarctica, and the largest hot desert in the world.
Arabic is the most widely spoken language in the Sahara region, from the Atlantic to the Red Sea.
The countries which Sahara desert encompasses include Algeria, Chad, Egypt, Libya, Morocco, Mauritania, Mali, Niger, Sudan, Tunisia and Western Sahara.
The Sahara desert is home to quite a few species of animals. Camels and goats are the only ones amongst the domesticated animals one may see out here. Apart from these, the Saharan cheetah, the sand vipers, scorpions, and monitor lizards can be found out here.
When rocks are physically weathered they become smaller, but are still the same type of rock. In deserts exfoliation and freeze and thaw are the main types of physical weathering.
Freeze and Thaw
Biological weathering is when physical and chemical weathering is taken out by plants and animals.
To end this is a little clip on the wildlife in the Sahara desert.