Mount Etna in Sicily, Italy, is an example of a composite volcano ... vents in explosive eruptions. When magma erupts from a volcano it is called lava. This mixture of lava and gas flows out ...

Volcanoes are formed when magma (liquid rock ... eruption can sometimes benefit its surroundings. For example, the ash and lava (if not too thick) can break down to create extremely fertile ...

"In the past, the distinct chemical compositions of lavas from Kīlauea and Maunaloa were thought to require completely separate magma pathways ... in their lava chemistry. "For example, during ...