But this volcano "Kawah Ijen" found in Indonesia is one of the active Volcano. But the speciality of this volcano is not like the other volcanos, it ejects blue colour molten lava instead of usual red colour lava.

Now it is a question that why the lava colour is blue ? The answer to it is in chemistry. The volcano has high rich content of sulphuric gases, this sulphuric gas on combustion with atmospheric oxygen at high temperatures gives the dazzling blue colour to the lava. But this blue colour of lava can only be seen during the night time.

At the top of the volcano "Kawah Ijen crater lake" is found which is world's largest body of water filled with hydrochloric Acid, it is so because the hydrogen choride gas from the volcano reacts with the lake water and condense to form hydrochloric acid and it's PH is almost zero, also the water colour is green due to the presence of excess hydrochloric acid. The sulphur riched rocks found around the volcano are considered among the purest form of sulphur.

Volcanos are one of the nature's marvel. They are present on earth from the very ancient times and also considerd as the natural polluters. But not all the volcanos are active ones, some of the are Dormant while others are may be extinct.