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Australia has lots of ancient volcanoes. But how did they form?
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Mount Ngungun, in the Glass House Mountains, is part of Australia s ancient volcanic past.
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If you are heading on a road trip this summer, you might drive past several ancient sentinels of Australia s volcanic past.
Many of them, like the Glass House Mountains, are hard to miss.
These ancient volcanic plugs are all that is left of eruptions that occurred around 25 million years ago.
They are among hundreds of ancient volcano remnants that extend 3,500 kilometres from Tasmania to northern Queensland.
While the Glass House Mountains stand out in the landscape, other remnants are just weathered nubs hidden in the bush or a series of caves hollowed out by lava.
19 DECEMBER 2020
Geologically speaking, Australia is a relatively quiet place to live. Earthquakes are rare and typically gentle, and as for volcanoes, there hasn t been as much as a burp of magma on the mainland in thousands of years.
It wasn t always this way. In fact, the land is littered with the remains of mysterious eruptions that shattered the crust with surprising regularity over the past 80 million years.
A new study suggests some of the more unusual periods of activity were the result of an ancient seafloor squeezing its way beneath the plate, providing the perfect batter for an extensive course of eruptions right down the length of the continent.
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