Hans Jenny (1899-1992) was a soils teacher at UC Berkeley, a pedologist. He distilled the factors that drive soil formation into an equation signified as CLORPT. The CL imate, O rganisms, R elief, P ...

Soil pile. Brown geometric dirt heap in cartoon style. Vector illustration isolated on a white background. Ground clipart for construction, agricultural, environmental, gardening designs. Royalty-free ...

Cartoon compost worm in soil. Isolated vector funny earthworm characters with smiling faces stick out of compost pile with organic waste. Useful insects in garden, nature invertebrate pest creatures ...