Which of these statements best explains why the soil around a volcanic region is fertile?

Volcanoes always contribute to flooding, which enriches the soil.
Particles released by volcanoes contain sulfur, which is good for soil.
Volcanoes aid in the formation of new rocks, which help form fertile soil.
Particles released in the air by volcanoes fall to the ground and enrich the soil.

Question

Which of these statements best explains why the soil around a volcanic region is fertile?

 Volcanoes always contribute to flooding, which enriches the soil.
 Particles released by volcanoes contain sulfur, which is good for soil.
 Volcanoes aid in the formation of new rocks, which help form fertile soil.
 Particles released in the air by volcanoes fall to the ground and enrich the soil.

anonymous · Answer

The fertile soil is a result of the breakdown of various minerals - such as olivine, pyroxene, amphibole, and feldspar (the essential ingredients of volcanic ash and lava) which releases iron, magnesium, potassium etc to the soil. So i think its D.