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Why is the opal Australia's national gemstone?

  1. In Aboriginal legend, a rainbow touched the earth and created the colours of the opal.

  2. From this time forward, I pledge my loyalty to Australia and its people.

  3. It has bright green leaves and many golden yellow flowers in spring.

  4. Parliamentary democracy.

The correct answer is: In Aboriginal legend, a rainbow touched the earth and created the colours of the opal.

The opal is recognized as Australia's national gemstone due to its deep cultural significance, particularly in Aboriginal legends. According to these legends, it is believed that a rainbow touched the earth, leaving behind the vibrant colors found in opals. This story reflects the connection between the gemstone and the country's natural beauty and Indigenous heritage. The other options, while they may hold importance, do not relate directly to the reasoning behind the opal's designation as a national gemstone. The second option pertains to a pledge of loyalty to Australia, which is more associated with citizenship than with cultural symbols. The third choice describes the characteristics of a plant, not a gemstone, and the last option discusses the political system of Australia, which is unrelated to the significance of the opal in Australian identity and culture.