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WHY WAS THE SAHARA DESERT ONCE A LUSH PARADISE AND NOW A DRY DESERT? By Imogen and Emma

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Elizabeth Harris

on 25 November 2015

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Transcript of WHY WAS THE SAHARA DESERT ONCE A LUSH PARADISE AND NOW A DRY DESERT? By Imogen and Emma

WHY WAS THE SAHARA DESERT ONCE A LUSH PARADISE AND NOW A DRY DESERT?
WHAT WAS LIFE LIKE BEFORE AND AFTER THIS EVENT?
Before these rains few animals and few people lived in the Sahara. One of the only suitable places for people to live was the Nile Valley. These populations would experience many major sandstorms wrecking their living environment. The Sahara is actually the largest hot desert and covers 9.4 million square kilometres. This desert has very few animal species but does include rodents, snakes, scorpions and camels.



During this natural phenomenon people from the Nile Valley entered the Sahara and many animals entered including, giraffes, elephants, rhinoceroses, hippopotamuses and crocodiles. As you can see all of these animals need food and water to survive, during this phenomenon the Sahara was able to provide the food and water that the animals needed . The people from the Nile Valley stayed and lived for many years beside river pools, rivers and green valleys.
WHERE DID THIS PHENOMENON OCCUR?
The Sahara desert is located in the Northeren Hemisphere in North Africa. The Sahara desert covers many countries including Algeria, Libya, Egypt, Mauritania, Mali, Niger, Chad and Sudan. The landscape of the Sahara desert is made up of sand dunes, mountains, plateaus and sand and gravel covered plains.
TIMELINE
22,000 to 10,500 years ago the Sahara was hot and dry with little animals and vegetation. The only place suitable for life was the Nile Valley.
10,500 to 9,000 years ago monsoon rains washed over Sahara, transforming the region into a habitable area for people in the Nile Valley.
9,000 to 7,300 years ago continues rains, vegetation growth and animal migrations happened, which lead to well established human settlements including livestock such as sheep and goats.
7,300 to 5,500 years ago rains stoped in Sahara, prompting humans to moving back to the Nile Valley. The end of the rain ment the return to the desert conditions throughout the Sahara after 5,500 years.
WHY, WHEN AND HOW DID THIS PHENOMENON OCCUR?
After the Ice Age the Sahara desert was still just as dry and uninviting as it is now, but between two periods of dryness was a few thousand years of rain and vegetation. 10,500 years ago lots of rain fell upon the Sahara desert, it grew vegetation and many animals entered into it's borders, even though it did take a few hundred years for it to actually grow the plants. The reason of this change in weather was due to the fact that the earth had changed it's orbit. It changed from 24.1 degrees to 23.5 degrees and then back again. It all depended on the five factors including the location, time, season, weather and landscape. All of these factors worked together and resulted with green vegetation and a living environment . Due to this phenomenon people were able to survive but now are unable to live or survive in the Sahara Desert.
By Emma and Imogen
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