Question

why earthworms come on the surface during rainy season

Answer 1

When the rain hits the ground it creates vibrations on the soil surface. This causes earthworms to come out of their burrows to the surface. Earthworms find it easier to travel across the surface of the soil when it is wet, as they need a moist environment to survive.

Answer 2

during the rainy when water gets into the holes in the soil is the organisms living in the soil come out for respiration it is due to this that organisms like earthworms come out of the soil during heavy rain