Some explosive volcanoes can send ash high up into the sky and it can travel around the world over different countries.
When magma rises towards the surface gas bubbles start to form. Whether or not they can escape as the magma is rising affects how explosive the eruption will be.
A massive fast moving lava flow from Kilauea consumes everything in its path, as the flames from the remnants of one home burns on the left, while it approaches another on the right.
EPA/Bruce Omori/Paradise Helicopters
The current eruption of Kilauea on Hawai'is big island can tell us a lot about what is going on beneath the volcano and may provide lessons for future eruptions.
Lava flows from Kīlauea.
At Kīlauea in Hawai'i, a recent volcanic eruption has created some of the most spectacular sights in nature. But also danger for those around it.
An ash plume rises from the Kilauea volcano on Hawaii’s Big Island.
AAP Image/CrowdSpark/Jillian Marohnic Volcano Hideaways
The Kīlauea volcano on Hawai'i's big island is threatening to produce violent and energetic eruptions not seen since 1924.
Lava flow moves in the Leilani Estates subdivision near Pahoa on the island of Hawaii, May 6, 2018.
USGS via AP
Fountains of lava from Hawaii's Kilauea volcano are dramatic, but the most deadly impacts of volcanic eruptions are toxic gases and ash and mud flows.
Seismic shockwaves after a meteorite’s collision could affect systems all over the planet.
Research suggests a new threat to life on Earth from the meteorite's crash: Via seismic waves, the impact triggered massive undersea eruptions, as big as any ever seen in our planet's history.
A new study has found a way to predict eruptions at Mount Etna within two weeks.
Tourism businesses should start by communicating precisely what they are going to do about the situation to the customer - quickly and clearly, to reduce uncertainty and avoid confusion.
Businesses worth their weight in salt should at least in principle have the capacity to remedy situations that go wrong, as part of their modus operandi.
Mount Agung began erupting last week, sending ash columns two kilometres high.
To the people of Bali, Mt Agung is not just a volcano. The "great mountain" holds spiritual power and reflects cultural and political unrest.
Where there’s smoke, there will be lava?
U.S. Geological Survey via AP
How do scientists predict volcanic eruptions? To do so with accuracy, they need to know the individual volcano and its history very well.
The eruption of Mount Agung viewed from Muncan Village in Karangasem district, Bali, on November 28, 2017.
Muhammad Fauzy Chaniago/AAP
The world watches and waits to see what will happen next at Bali's Mt Agung, an active volcano.
Balinese students walk to their school as earthquakes continue and Mount Agung threatens to erupt.
Hundreds of earthquakes a day are being recorded near Mount Agung in Bali as the volcano threatens to erupt for the first time in more than 50 years.
Residents and tourists are warned to stay at least six kilometres from Mount Agung in Karangasem, Bali, Indonesia.
Warnings are being issued to stay clear of an Indonesian volcano following a series of earthquakes.
Mount Etna: boiling over … again.
The clock is ticking.
The incredible Blue Lake at Mount Gambier fills one of the craters from the last volcanic eruption just 5,000 years ago.
ian woolcock from www.shutterstock.com
What can we expect Australia's next volcanic eruption to be like? That depends where and when it happens, and it could be sooner than you think.
Piton de la Fournaise or “Peak of the Furnace” on Reunion Island is one of the world’s most active volcanoes, shown erupting in August 2015.
What happens beneath the surface before a volcano erupts? Can we predict when one will blow? And how can typhoons and melting glaciers contribute to big eruptions?
US Geological Survey
Thirty five years after the devastating eruption of Mount St Helens, a volcanologist looks back on how it unfolded – and how it forever changed our understanding of how volcanoes work.
Gas and ash rise from the Calbuco volcano as seen from the city of Puerto Montt, Chile on April 22.
Ash and mudflows are the biggest dangers from the unexpected eruption from the Calbuco volcano in Chile.
Eruption of the Calbuco volcano, seen from Puerto Montt.
Two big eruptions have caused pyroclastic flows and high-altitude ash clouds over South America.
Many villagers will have little to return to.
Around 60 volcanoes erupt in the average year. On any particular day, there are usually about 20 volcanoes erupting somewhere in the world. Naturally, they can’t all make headlines. But when there are…