1. Agricultural endeavours are also very successful, benefiting from rich red volcanic soil . 2. Below the alluvial top soil are areas of granite and volcanic soils . 3. The local volcanic soil never becomes muddy even during the rainiest months, 4. "Erigeron elegantulus " grows on the rocky volcanic soils of the region. 5. The country's volcanic soils and subtle micro-climates make for near-perfect coffee-growing conditions. 6. Vine-covered cliffs rise above cornfields struggling to produce in thin volcanic soil . 7. Numerous volcanoes produce very fertile volcanic soil on many of the islands. 8. The boundaries of this appellation include with planted on thin volcanic soil . 9. The self-pollinating shrub is found at high elevations in volcanic soils . 10. Mesoamerican volcanic soils , for instance, are rich in arsenic and cadmium.