# 1.3 The formation of igneous rocks

Igneous rocks are defined as having solidified from a molten state, either inside the Earth or on the surface at volcanoes.

OpenLearn - Practising science: reading the rocks and ecology
Except for third party materials and otherwise, this content is made available under a Creative Commons Attribution-NonCommercial-ShareAlike 4.0 Licence, full copyright detail can be found in the acknowledgements section. Please see full copyright statement for details.