W hat have I learned?

1 List three reasons why the hydrosphere is important to humans.

2 Copy and complete the diagram.

5 Draw a picture of the water cycle showing each of the parts with a brief explanation.

6 Copy and complete the crossword puzzle about the elements and characteristics of a river.

3 Find the error in these sentences and correct it.

a) Groundwater can be either inland or marine.

b) Rivers, lakes and oceans are examples of inland waters.

c) Marine waters are bodies of fresh water.

d) Tides are movements of the waters of seas and oceans caused by changes in temperature and salinity, by wind or by the Earth's rotation.

4 Look at the images and say to which part of the course of a river each one belongs.

Across: 1. The land through which a river flows. 2. The final section of a river. 3. The course of the river from its source to its mouth.

Down: 4. Variation of the flow throughout the year. 5. The distance from the source to the mouth of the river.

7 Identify the river marked by each number.