What is a river?

What is a lake?

What is an ocean?

Can you name the five oceans in the Earth?

What is a spring?

What is a sea?

Can you name some rivers?

How is the flow of the Upper course of a river?

Where does the river start?

What is a tributary?

How is the flow of the Middle Course of a river?

What is the riverbed?

How is the flow of the Lower Course of a river?

What is a river basin?

What is an estuary?

What is drainage basin?

Where is the river Nile?

Where is the Amazon river?

What is the longest river in Europe?

What is the longest river on the Iberian Peninsula?

Where is the Yangtze river?

Where is the Mississippi river?

What is evaporation?

What is transpiration?

What is condensation?

What is sublimation?

What is precipitation?

What is collection?

What is an aquifer?

What is a water pump?

What are the man-made wells used for?

When does a natural spring occur?