What are volcanoes?

A volcano is a slot in Earth's crust that lets magma,hot ash and petrol to breakout.Volcanoes can look like mountains or small hills depending on what type they are.

Volcanic eruptions

Most volcanic eruptions are usually caused by tectonic plaits moving towards each other, which usually does a violent eruption.Other volcanoes such as Hawaii and Mauna Loa are caused by hot spots in the earth's crust.

Eruptions from volcanoes can be very dangerous.It can Prudence:

pyroclastic flows-fast moving ash,gas and rock

ash clouds-small peases of rock and glass that can be cared in the air for many kilometers.