Across
- 1. Starting material of soil
- 3. Igneous, sedimentary and metamorphic rock
- 6. Soil that feel gritty and always use in water filtration
- 9. Microorganism add into the soil to degrade the toxic or non-toxic substances
- 11. The outer skin off rock fall a part due to the temperature change during day and night
Down
- 2. The process of weathering involve carbonate minerals in rock
- 4. Type of soil that can hold water for a long time
- 5. The O horizon are black or dark brown colour because of their ________ content
- 7. Fertile soil
- 8. Formation process of soil from rock
- 10. Soil layer that contain very little humus and plant root can reach this area