Figure 2. Earthworms role in Pedogenesis acting at various scale (modified from Lavelle et. al., 2004)

From

Earthworms: 'Soil and Ecosystem Engineers' – a Review

Roshan Babu Ojha, Deepa Devkota

World Journal of Agricultural Research. 2014, 2(6), 257-260 doi:10.12691/wjar-2-6-1