What has urban overcrowding caused in North Africa?

Explanation:

People from the countryside are pouring into the cities looking for work and a better life. ... Rapid population growth has led to high unemployment rates in many North African countries, as there are not enough jobs to employ the population.

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the earthquake in haiti was a magnitude of 7.0 according to the u.s geological survey yet the smaller earthquake in haiti killed more than 200,000 and left more than 1.2 million people homeless. the chile earthquake was a magnitude of 8.8 and 500 times more stronger but chile's earthquake only injured 712 people.