Question

Which of these statements best explains why the soil around a volcanic region is fertile?
Volcanoes aid in the formation of new rocks, which help form fertile soil.

Volcanoes always contribute to flooding, which enriches the soil.

Particles released by volcanoes contain sulfur, which is good for soil.

Particles released in the air by volcanoes fall to the ground and enrich the soil.

Answer 1

please help

Answer 2

It seems to be a complicated question. As best I can tell, the main reason is that volcanic ash is composed of extremely fine irregular glassy particles that form a very light and very porous soil. This has three important effects:

(1) It's easy for roots to grow through it.

(2) It retains water very well, in all the tiny nooks and crannies.

(3) It also tends to retain important fertilizing anions, such as phosphate (PO4-3) and nitrate (NO3-), apparently because these can easily exchange with silicate (SiO4-4) groups near the surface of the volcanic glass particles.

It seems to have nothing to do with any particular mineral already in the ash when it rains down, but much more to do with its ability to retain water and useful anions afterward.