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When we talk about natural hazards, we usually think about the damage and danger they cause — destroyed homes, injured people, and ruined land. However, natural hazards can also create opportunities — that means they can bring benefits or useful resources to people and places.
This might seem surprising, but some of the most populated and productive places on Earth are located right next to active volcanoes or flood-prone rivers — and that is often because of the opportunities those hazards provide.
Flooding happens when a river overflows its banks and water spreads across the surrounding land. This can be dangerous, but it also carries something valuable: silt.
Silt is a type of very fine soil made up of tiny particles of rock, minerals, and organic material (decayed plants and animals). Rivers pick up this silt as they flow over land. When a river floods, it slows down and drops this silt onto the fields nearby — this process is called deposition.
The River Nile in Egypt is a famous example. For thousands of years before modern dams were built, the Nile flooded every year and deposited rich silt on the surrounding land. This made the land along the Nile incredibly fertile, which is why ancient Egyptian civilisation was able to grow food successfully in an otherwise dry desert region.
Similarly, the Ganges River in South Asia floods regularly, and the silt it deposits supports the farming of millions of people.
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