How does a volcano affect the environment?

Question

(plants animals humans......)

Answer 1

if a volcano errupts, it spews out lava giving good soil, it can kill off trees and beings living in the area, and also the ashes could cover the skies for days to even weeks not giving the plants light to grow.

Answer 2

good fertile soil - agriculture

if its explosive obviously lava flows etc damage wildlife habitats and can damage human property etc