Across
- 4. things that do not come from an animal or plant
- 5. surface soil usually including the rich upper layer in which plants have most of their roots and which the farmer turns over in plowing
- 6. layer of solid rock immediately beneath the surface soil in geology found on terrestrial planets such as Earth
- 7. a layer of weathered material that lies just under the surface soil
Down
- 1. a brown or black product of partial decay of plant or animal matter that forms the organic portion of soil
- 2. a solid sediment that is similar to dust
- 3. chemical substances found in every living thing on Earth