Updated: 17/10/2011 11:33 | By Charlotte Amelines, contributor, MSN Travel
30 natural marvels you’ve probably never heard of

Shark Bay, Australia



Shark Bay stromatolites (Image © Frans Lanting/Corbis)
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Of all the natural wonders on this list, Shark Bay is perhaps the most significant. Though it’s hardly extraordinary to look at or even particularly well-known outside the country, this bay in north-western Australia contains strange little hillocks formed by some of the earliest life-forms on earth – marine stromatolites. To these 3,500-million-year-old organisms all life as we know it owes its existence, on account of the way they absorb carbon dioxide and emit oxygen.

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