<h2>
The End of Trans-Saharan Trade Routes:</h2>
Explanation:
The factors that led to the end of trans-Saharan trade routes are:
- Civil unrest due to collapse of the Songhay Empire, the Timbuktu, by the Morracans in 1591
- The extreme desert conditions like extreme climates, excessive heat, lack of water and food etc made the travel logistics very tough. This made people opt for other transport systems
- Huge advancements made in maritime travel
- Exploration of West African trade routes
- Economic, political and social changes which led to the end of trans-Saharan trade routes
Answer:
Option D, Oil forms because of geologic heat and pressure and can be found around the world in varying amounts.
Explanation:
Oil existing beneath the earth surface is primarily due to the deposition of organic matter millions of years ago with in the deep earth crust.
This deposition was uneven. With the temperature and pressure, the organic matter converted into fossil fuel (oil, coal etc.)
Hence, option D is correct
Solution. Models are being used as a simplified representation of an object, idea, or an event that is too complex, too small, or too big to study. Scientists use models in order to show how a certain phenomenon occurs and to answer the questions regarding it.
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