The Journey of Water From Source to Sea

The video explores the journey of a river from its source in the mountains to its mouth at the sea. It begins with the source, where water originates from springs, rain, or melting snow. The upper course is characterized by fast-flowing water that carves valleys and canyons. Waterfalls form where hard rock meets soft rock. In the middle course, the river slows and meanders, with tributaries joining in. Finally, the lower course sees the river widen into estuaries or deltas, depositing sediment and providing nutrients for ecosystems before reaching the ocean.

What is the primary source of water for oceans and seas?

• Evaporation

• Underground lakes

• Rainwater and melting snow

• Ocean currents

Where does a river typically begin its journey?

• In the desert

• At the river mouth

• In the ocean

• High up in the mountains

What natural feature is formed when a river flows over both hard and soft rock?

• A lake

• A waterfall

• A delta

• A tributary

What causes a river to meander in its middle course?

• Tidal forces

• Human intervention

• Natural erosion

• Strong winds

What is a tributary?

• A river that flows into the ocean

• A small river that feeds into a larger one

• A river that dries up

• A river that forms a delta

What happens to a river as it reaches flatter ground?

• It disappears

• It slows down

• It forms waterfalls

• It speeds up

What is formed at the end of a river's journey?

• A canyon

• A river mouth

• A tributary

• A waterfall

What is an estuary?

• A dry riverbed

• A narrow river

• A wide river mouth

• A mountain stream

What role does sediment play in a river's lower course?

• It provides nutrients for plants and animals

• It speeds up the river

• It creates waterfalls

• It causes the river to dry up

What is the final destination of a river?

• The ocean or sea

• A desert

• A lake

• A mountain