Educational worksheet on soil formation featuring fill-in-the-blank questions, matching soil components with percentages, and a drag-and-drop activity illustrating the stages of soil development.

Final Answer:
1. Soil is the top layer of soil of the Earth’s surface where plants grow. Soil is also an ecosystem with its rich biocenosis and biotope which changes often.
2. Organic matter — 25 %
Air — 5 %
Water — 45 %
Mineral matter — 25 %
3. From left to right:
- Rocks are gradually broken down by the action of water and wind. The rock particles mix with other sediments.
- Fungi, lichen and some bacteria accelerate the breakdown of rocks, creating moist clay with nutrients.
- Herbaceous plants colonize the area, along many invertebrates that live in the soil, like worms.
- Tree and shrub roots penetrate the soil making it more porous, increasing soil fertility and the amount of nutrients.