Answer: Flowing rivers have caused boulders and rocks to become smooth. The water rushing against them rounds out the pointed edges.
After the Mongols defeated the Delhi Sultanate in India during the 16th century, the Islamic religion advanced into Central Asia.
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The feudal system was just like an ecosystem - without one level, the entire system would fall apart. The hierarchies were formed up of 4 main parts: Monarchs, Lords/Ladies (Nobles), Knights, and Peasants/Serfs. Each of the levels depended on each other on their everyday lives.
Some groups in South America continued to live as nomads after the development of agriculture because their traditions and knowledge were very important and they didn't want to lose them. They wanted to preserve their lifestyle and values.
Nomads are people who live in communities that move from place to place, instead of settling down in only one location. There are three different types of nomads: pastoral nomads, hunter-gatherers, and peripatetic nomads.
Brunelleschi solve his problem with the dome of the Florence Cathedral by employing sets of diagonal ribs based on the pointed arch and he also created many layers of support within the dome. The answer in this question is by employing sets of diagonal ribs based on the pointed arch.
