Questions

The great Sahara Desert created an opportunity for wealth by trading to peoples who live in and around the region. The city of Timbuktu was built as a result of this trade.

Hundreds of years ago, salt was a very valuable commodity. It was valued for its taste as well as its ability to preserve food. One of the most productive areas for producing salt was the Sahara Desert, and the city of Timbuktu was built to capitalize upon this trade.

The hot dry summers and cool wet winters are especially suited for citrus fruits and therefore these lands are some times reffered to as the 'world's orchard land' .

The law of demand implies that "The higher the price of a good, the lesser the quantity demanded".

For example:

If the rate of a mobile phone increased, the quantity demanded by the customers is decreased.

Fluoride deficiency is a disorder which may cause increased dental caries due to a lack of fluoride in the diet. Dental caries or tooth decay is the breakdown of dental tissues by the acidic products released by the "bacterial fermentation of dietary carbohydrates”