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Giants Causeway, Ireland
Credit: Causeway Adventure
The Giants Causeway columns formed 50 to 60 million years ago when lava repeatedly flowed and cooled as it came into contact with the sea. The pillars are polygonal shaped due to the cooling of the layers of lava and the atomic structure and natural fracturing of basalt. There are 40,000 basalt pillars, each with 5 to 7 irregular sides. This process is similar to the mud cracks seen when mud dries after heavy rains.
Source: forbes.com
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Quartz xenocryst with reaction corona made by clinopyroxene. Vulsini volcano (Italy). XPL (cross polarized light micrograph). 10x
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