The structure, known as El Volcán, was probably erected deliberately to look like a volcano.
The ash was found at the bottom of an Arctic lake in Norway.
These are the first volcanoes shown to be created by a massive meteorite impact.
The gentoo penguins of Ardley Island have shown remarkable resilience for thousands of years.
Lavas form when 'mélange' metamorphic rocks melt under volcanic arcs, geologists argue.
Ina is the result of an eruption 3.5 billion years ago.
Europe's most active volcano is undergoing a new phase of activity.
Hydrogen spewed from volcanoes could help warm a planet in zones considered too cold for life to exist.
Mass eruption at one of the world's biggest volcanic features contributed to extinction of the dinosaurs.
Quartz crystals at Lake Toba reveal change in magmatic system just before eruption.
The supervolcano is close to Naples, which has a population of 1 million people.
About 80% of the world's volcanic activity happens underwater - now scientists have caught an eruption in the act.
New research has challenged the accepted view of what makes magma rise up under the sea.
The melt source region for Mt St Helens does not reside directly beneath the volcano.
Iceland is just one of many countries that are starting to harness energy from volcanoes.
The underground pocket of magma is still pushing the dome even higher today.
However, there were no injuries or damages, reports said.
Experts warning pattern of earthquakes across the south-west of the Island could cause Mount Teide to erupt.
350 villagers living in volcano's shadow were taken to a nearby shelter on Friday.
Locals wait inside the crater with nets to catch the money and food meant for the gods.
Mayan populations in the Zapotitan Valley may have survived an eruption with the help of neighbouring communities.
Farmers had been illegally returning to land they had been rellocated from in 2014