Japan warned tourists to keep away from popular Mount Aso after it began belching smoke and ash into the air, the latest eruption in one of the world's most volcanically active countries.
Southern Chile's Calbuco volcano erupted for the first time in nearly half a century, spewing a giant funnel of ash 10 kilometers (six miles) into the sky.
Small volcanic eruptions could be slowing global warming by spewing sulfur aerosols that reach the upper atmosphere and reflect sunlight away from the Earth.
Flights into and out of the northern Australian city of Darwin were cancelled Saturday and some to Bali affected due to huge ash clouds thrown up by an Indonesian volcano.
Peruvian authorities began evacuating 4,000 people Thursday from villages near a volcano that has seen significantly increased activity, spewing smoke and ash.
Residents have fled villages near Peru's Ubinas volcano, which this week began spitting out white hot chunks of rock, some as big as 30 centimeters (one foot) in diameter.