6. MINERALS ARE USEFUL
We use minerals like gypsum to build buildings.
We use minerals like diamonds to make jewellery.
7. ROCKS
Rocks are materials made up of minerals.
We dig mines to obtain rocks that are under the ground.
We dig quarries to obtain rocks that are on the surface.
8. ROCKS ARE USEFUL
Slate,marble and granite are used for building.
Coal is used for fuel.We burn it to obtain heat.
12. POOR GROUND
Poor ground has little water, air and humus.
Only resistant plants, like olive trees, can grow in
poor ground.
13. VERY POOR GROUND
Very poor ground, for example in the desert, very few
plants can grow there.
14. UNDERGROUND WATER
Some water from rain filters through the ground,
and reaches the bottom layer of rocks.
These rocks do not let the water filter any further.
It stops and becomes underground water.
15. OASIS
In deserts, this underground water creates an oasis.
An oasis is where people and animals can find water.