sentence: Felsic magma is thick and has lots of a mineral called silica.
sentences_before: In volcanology, 'magma' is melted rock that is under the ground. It is like lava, which is melted rock above the ground. There are many types of magma. One is called felsic magma.
sentences_after: It mostly makes light-coloured rocks. Another type is called mafic magma, which is runny and has less silica. It usually makes dark-coloured rocks. A third type is intermediate magma. It is like both the other types.
concept_name: felsic magma
headings: Magma
categories: Volcanology