A volcano has erupted in Iceland's Reykjanes peninsula, spewing hot lava, toxic gases and ash into the air, amid fears that this could be the start of another long period of volcanic activity in the Nordic country.

Watch: Iceland volcano spews hot lava into air in sixth eruption within eight months

Scientists have discovered "megabeds" from ancient volcanic eruptions at the bottom of the Mediterranean Sea, showing the evidence of several millennia of catastrophic events that hit the region in every few thousand years.

Europe witnesses catastrophic events every 10,000-15,000 years, supervolcano megabeds reveal

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Watch: Iceland volcano spews hot lava into air in sixth eruption within eight months

Europe witnesses catastrophic events every 10,000-15,000 years, supervolcano megabeds reveal