A volcano is a big (mountain, magma chamber, a volcanoAt the end of a volcano there is a magma chamber There is magma in the magma chamber.Magma is very hot liquid rock. Sometimes magma comes out of(mountain, magma chamber, a volcano).If magma comes out very often, we call a volcano active . If magma does not come out of a volcano for a very long time we call it(an inactive volcano, magma chamber, mountain) . When magma comes out of a volcano we call it lava. ​