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When he magma is about half way up the main vent it turns into lava. Lava is a very hot liquid which burns the remaining rocks from the magma. The lava slowly continues up the main vent. While going up, the lava continues to get hotter and hotter. Ash and rocks are collected by the lava and the lava is getting hotter and hotter while it is continuing its way up the main vent. When the lava is at the top of the main vent the volcano erupts. The lava blasts out of the volcano along with ash, rocks, and a cloud of dust which is ere thick.
The ashes and rocks crumble to the ground, but the lava is moving down the volcano side very slowly or at a high speed. The lava burns down almost everything in its way, and it sometimes leaves bits of things burning behind. The lava from the volcano can cool fast, or sometimes the lava will slowly cool down from its intense heat. Lava that cools slowly forms into igneous rocks. Volcanoes can also damage themselves in the eruption. A volcano literally blows its top off.
Volcanoes can be under water or on land. Volcanoes that are under water take more time to erupt but if they are on land it can erupt really fast, because some volcanoes are under water the water slows down the magma and lava but if the volcano is on land the lava and magma can move quicker up the main vent. It just depends on the environment and how fast the volcano can make the magma the magma makes lava and the volcano makes an explosion. This is how a volcano erupts.