Volcanoes are usually linked with exotic islands in the Pacific or dramatic landscapes in Iceland. What many people don't ...

They are formed by lava welling up to the surface, where it cools and hardens, while denser material left in the mantle below a tessera forms a plateau made from a substance called residuum.

Scientists have located where a meteor crashed to Earth 790,000 years ago, saying the crater from the ancient impact is in southern Laos on the Bolaven Plateau.