volcano

For a rare, if not lucky, few days a year, Yosemite National Park’s famed El Capitan granite cliff converts into what looks like an active volcano jutting 3,000 feet above the valley floor.

Aleasha, 20, said it was a "big shock" when questions about "the acidity of volcanoes" came up in her science exam, rather than the health-based questions she had been preparing for.

Several airlines have cancelled flights to and from Bali due to dangerous ash clouds from a volcano near the Indonesian holiday island.

At least 10 people have been killed after a volcano erupted in eastern Indonesia in the early hours of Monday, officials have said.

That can cause the dynamic subterranean forces below volcanoes to produce increased quantities of magma, leading to more frequent eruptions.