Across
- 1. a layer of rock
- 5. colourless, odourless gas that is all around us
- 6. the second layer of soil that is made of minerals
- 7. The top layer of soil on a garden bed
- 8. an insect that helps the roots grow in soil
Down
- 2. a mixture of sand, clay and silt
- 3. an element of what makes up soil
- 4. the lowest layer of rock, nothing lives there