Volcano

Mount Merapi unleashed clouds of hot ash and a mixture of rock, lava and gas that travelled miles down its slopes.

The eruption at Mount Semeru, in East Java, is thought to have been triggered by monsoon rains, which eroded and collapsed the lava dome atop its peak.

Hawaii’s Mauna Loa, the world’s largest active volcano, has started to erupt for the first time in nearly four decades, prompting volcanic ash to fall nearby.