11. In the period of its creation the soil layer was only, and today it is to. 12. The archaeological site comprises 10 different soil layers . 13. The roots of the plant are within the shallow soil layer with some anchoring in rock fractures. 14. This action leaves the soil layers intact, rather than inverting or mixing them, preserving the topsoil structure. 15. With their roots protected below ground in the soil layer , perennial plants are notably tolerant of wildfire. 16. Loosening of already compacted soil layers by deep ripping may be beneficial for plant growth and soil condition. 17. However, like other burrowing rodents, they also play beneficial roles, including dispersing nutrients throughout the upper soil layers . 18. Builders of the object cut off a soil layer down to virgin clay and placed stones into this trench. 19. The geologic model is primarily defined using profile lines, which are lines defining the interface between different soil layers . 20. Six species of caecilians, a group of worm-like amphibians, are reported from the deep moist soil layers of the park.
