If supervolcanoes are so big, why did it take so long for scientists to discover them?

Since supervolcano don't generally look like volcanoes and they emit inconsistently. It doesn't look anything like a conventional stratovolcano or shield fountain of liquid magma, Hence it take so long for scientists to discover them.

Explanation:

There are numerous super volcanoes around the globe other than Yellowstone, including California's Long Valley, Japan's Aira Caldera, Indonesia's Toba, and New Zealand's Taupo.

However following quite a while of study it was perceived that the caldera occasionally has colossal emissions. This last super volcano is the last to have at any point discharged a super-emission, which burst free nearly 26,500 years prior.

The Yellowstone caldera, for instance, is a major woodland and lake-filled zone with some fumaroles and fountains.

Super volcanoes happen when magma in the mantle ascends into the covering yet can't get through it and weight works in an enormous and developing magma pool until the hull can't contain the weight.

fertilization is the union of an egg and a sperm cell i believe.

i also have the same question.