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The experiment

Get two sponges and lay one on top of the other. Pour water (precipitation) on top and it will seep through the top sponge downward into the bottom sponge. If you stopped adding water, the top sponge would dry up and then the bottom sponge would dry up too. Now, put a piece of plastic between the sponges (making the bottom sponge an impermeable rock layer that is too dense to allow water to flow through it). Now when you pour water on the top sponge, the water will seep downward until it reaches the plastic. The top sponge will become saturated, and when the water comes to the plastic it won't be able to seep into the second sponge. Instead, it will start flowing sideways and come out at the edges of the sponge (horizontal flow of ground water). This happens in the earth all the time – and it is an important part of the water cycle.

V. Get ready to render the text

5.1. Answer the questions:

1. What is ground water a part of?

2. Where does precipitation seep?

3. What two kinds of soil can you find in the diagram?

4. What layer does ground water reach?

5. What forms of surface water bodies do you know?

6. Is the ground above the water table saturated? Is it wet?

7. What is the content and function of unsaturated zone?

8. Where is the saturated zone situated?

9. Where is water kept in the saturated zone?

10. What factors are responsible for the accumulation and movement of ground water?

5.2. Work in pairs. Ask your groupmate questions in English about the following matters and let him / her answer them:

– що таке материнська порода;

– які є види корінної породи;

– чи накопичується ґрунтова вода в граніті;

– у яких породах є більше порожнин;

– як утворюються порожнини в материковій породі;

– у яких напрямках рухається вода в земній корі;

– як залягає порода;

– у яких шарах вода рухається горизонтально;

– що притягає воду до центру Землі;

– чому воді важко рухатися у шарах граніту і глини.

5.3. Add two sentences to the given statements using the information from the text and exercise 4.8:

1. Ground water is formed of precipitation (rain, snow, hail).

1. ... 2. ...

2. In the vertical cross-section of the Earth one can see two types of soil.

1. Unsaturated soil ... 2. Saturated zone ...

3. The bedrock is the rock situated below the surface of the Earth.

1. ... 2. ... 3. ...

4. Water in the Earth’s crust can move at a downward angle and in a horizontal manner. Factors responsible for the movement and accumulation of water are the following.

1. ... 2. ...

5.4. Using the keywords speak about:

1. The Earth’s waters:

may be classified as, surface water, ground water, includes, water bodies, is formed of, precipitation, seeps down, reaches, rock material, saturated with.

2. Zones of ground relative to the content of water:

Unsaturated soil, saturated zone, is situated, above the water table, below the water table, wet, does not stay saturated, the dirt and rock, contains, air, some water, support, pores between rock particles, cracks.

3. Types of rocks in the bedrock:

Is situated, below the Earth’s surface, sandstone, granite, limestone, dense, porous, contain, void spaces, ground water, accumulates, become fractured, fill with water, are dissolved by water, results in, large cavities.

4. Movement of ground water:

Factors, responsible for, gravity, the rocks, pulls water, towards the center, at a downward angle, reaches, dense rock layer, granite, clay, has a hard time, penetrating, rises towards, a more porous layer, moves, in a horizontal manner.

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