Rivers
⭐ MasteredRivers flow downhill from mountains to the sea. The Nile in Africa and the Amazon in South America are among the longest.
Many ancient cities grew beside rivers for water and farming.
All about Rivers
A river is a large natural stream of water that flows towards a lake, sea or ocean. Rivers start at a source, often in mountains or hills, and flow downhill, carving valleys as they go. Water collects from smaller streams and rain as it travels.
The Nile in Africa and the Amazon in South America are among the longest rivers in the world. Rivers have been vital for people since ancient times because they provide water, food, transport and fertile soil for farming.
They carry water, soil, sand and pebbles along their path. A river often starts as a small stream high in the hills and grows bigger as other streams join it.
Rivers have shaped the land over time, carving valleys and creating fertile plains. People have settled along rivers for thousands of years because they provide water for drinking, farming and travel.
🎮 Try it yourself!
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👀 What the animation shows
This animation shows a small stream in the hills joining others and growing into a wide river that flows down to the sea. Watch how the water always runs downhill.
Real-life uses of Rivers
- Supplying drinking water to cities
- Carrying ships, boats and goods
- Irrigating farmland so crops can grow
Frequently asked questions about Rivers
Where does a river start?
Most rivers begin at a source, such as a spring, a lake or melting snow high in the mountains.
What is a delta?
A low, flat area of land formed at a river's mouth where it drops sediment as it enters the sea.
Which is the longest river in the world?
The Nile and the Amazon are both very long, and scientists still debate which is longer.