Negative effects of volcanoes

There are a lot of negative effects:

Large amounts of debris and magma spew out from the vent. In the process, ash clouds come rolling in and could possibly kill you. Some ash clouds could get so big that they could end the world. As it travels.

Volcanoes are dangerous - they can kill people and damage property and services.

Economic activity can suffer as it is hard for businesses to operate and recover after an eruption.

Natural habitats are disrupted and animals and plants are destroyed.