Daily lessons coming soon
Beginning Monday 20 April, BBC Bitesize will publish daily online lessons for all ages. We'll also have a new dedicated TV channel full of learning content, podcasts on BBC Sounds and loads of educational video on iPlayer.
Volcanoes form when magma reaches the Earth's surface, causing eruptions of lava and ash. Find out about different types of volcano, how to measure their strength and preparing for volcanoes.
Krakatoa volcano in the Sunda Strait, Indonesia