Reasons
1) the lack of an effective central government means there is nowhere for the somali people to turn for aid
2) the country dry climate makes it nearly impossible to grow enough food to feed all of the somali people
3) constant clan warfare deprive the somali people of the goods and services they need to acquire the basic necessities for life
Usually it forms or consist of fog
If the earth's gravitational pull gets three times stronger your weight increases three times your original weight.
The trolleys have been reduced over the last decades, after their initial increase as a public transportation, when new and better ways were discovered/produced for transport, their decline has started.
The buses since their invention, had grown in number and became a very important part of every city's public transportation, and still are.
The rapid transit is the most recent one of the mentioned in here. It's popularity has grown, number increased, and is very practical because it is not causing traffic mess. It is very important transport asset nowadays and makes lives of millions of people much easier.
