<P> Scientists usually consider a volcano to be erupting or likely to erupt if it is currently erupting , or showing signs of unrest such as unusual earthquake activity or significant new gas emissions . Most scientists consider a volcano active if it has erupted in the last 10,000 years ( Holocene times ) -- the Smithsonian Global Volcanism Program uses this definition of active . Most volcanoes are situated on the Pacific Ring of Fire . An estimated 500 million people live near active volcanoes . </P>
<P> Scientists usually consider a volcano to be erupting or likely to erupt if it is currently erupting , or showing signs of unrest such as unusual earthquake activity or significant new gas emissions . Most scientists consider a volcano active if it has erupted in the last 10,000 years ( Holocene times ) -- the Smithsonian Global Volcanism Program uses this definition of active . Most volcanoes are situated on the Pacific Ring of Fire . An estimated 500 million people live near active volcanoes . </P>
where are most volcanoes above sea level located
where are most volcanoes above sea level located
Pacific Ring of Fire
Pacific Ring of Fire