How do you see Earthworms on rainy day?

Earthworm after rainfall

You must have seen a great number of earthworms  around your house, on
the roads and on the playground after rainfall.Most people think that they come
out from their underground homes after a rain because their burrows were flooded
with water.But earthworms are not afraid of water. They  can live in water for months
together, and in fact ,die if their skin is dried out.

            What these earthworms are actually afraid of is the waterlogged soil which
contains carbonic acid. This  is formed when certain chemicals in the soil are combined

with water. Carbonic acid enters the body of the earthworm throw the opening in its
opening and can kill it.It's  not the rainfall water but the chemical substance that bring
the earthworm out after a rainfall.