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Opal
Opal
Opal
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Have you ever seen an opal? Australia is the land of the opal. This precious stone is the country's national emblem for a good reason: more than 90 percent of the world's opals come from a remote central area of Australia sometimes called the "Red Center." They are mined in severe climatic conditions in the desert areas of Queensland, South Australia, and New South Wales. Despite the abundance and popularity of opals, scientists were unable until recently to explain exactly how or why so many of the earth's opals formed in Australia. Recent research findings at the University of Sydney have provided new insights into the mysterious formation of opals. Around 100 million years ago, an inland sea that covered 60 percent of Australia began to dry out. This caused extraordinary changes in the makeup of the rocks, soil, and minerals of the region. Acidity levels in the sea first increased and then decreased. This helped create ideal conditions for opals to form. Central Australia is known to be the only place on earth where these types of changes have ever occurred on such a large scale. Surprisingly, these findings may help us better understand the environment on Mars. The red-colored dirt and terrain of Central Australia share many characteristics with the surface of the Red Planet. In 2008, astronauts found opal-like deposits on the planet, strengthening the belief that opals may also exist there. The discovery of opals on Mars could be the key to further proving the similarities between Mars and the landscape of Central Australia. This means that scientists may be able to study biological processes possibly present on the faraway planet, right here on earth.
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