It’s commonly quoted as fact that in nature, no food or vegetable is naturally blue.

This information was again disputed recently by the re-introduction of blue Smarties¹, this time using 100% natural seaweed extract to create the blue colour.

Additional support for the “blue-in-nature” brigade comes in the form of blue trees spotted on Google Earth. Firstly, in Australia’s Mount Annan Botanic Garden there’s a strikingly-blue tree.

The Garden’s website explains that the tree has been dead for many years, but is home to various types of termites and slaters.

So, it’s the termites that make the tree blue? Well, no. Further investigation reveals that the tree was in actual fact painted blue. For no particular reason.

Perhaps we’ll have better luck with this blurry shot of a blue tree in Northern California.

Unfortunately, this isn’t natural either. It’s the work of artist Claude Cormier, who decorated a perfectly normal tree with 70,000 blue Christmas baubles. Again, for no particular reason it would seem.

So perhaps natural blue is restricted to seaweed after all!

See a ground level pictures of the Australian tree and the American one on Flickr.

Thanks to Felippo, Logan and James.

Here in New South Wales, one of the most popular sights are the famous Three Sisters - three spectacular rock pinnacles which tower over the Jamison Valley in the Blue Mountains.

The rock spires are named Meehni (922 m), Wimlah (918 m), and Gunnedoo (906 m) and the view of them from the nearby observation platform at Echo Point is pretty dramatic. Apparently there’s a metal staircase here that leads down to the valley which is made up of 1,000 individual steps.¹

The Blue Mountains aren’t actually a range of mountains, but rather a vast plateau - with cliffs up to 760 metres high. There is truth in the “blue” part though - when viewed from a distance, the valley seems filled with an eerie blue haze that can also be seen in photos.

It’s widely believed that the blue colour has something-or-other to do with evaporating oil from the Eucalyptus trees that swamp the valleys, but in fact the hue is down to a process known as Mie Scattering which occurs when UV radiation is scattered by atmospheric particles.²

Read more about The Three Sisters, Jamison Valley, the Blue Mountains and Katoomba Scenic Railway at Wikipedia.

Thanks to Mr. Stokes and Glenn Baker.

We’re continuing the first annual GSS Desert Week! We’re mostly posting about deserts and it’s lasting about a week!

The Atacama Desert is a virtually rainless plateau in Chile, South America. Made up of salt basins, sand and lava flows, the 181,300 km² desert is more than 20 million years old, and as it only receives about 3mm of rain a year is considered to be one of the driest places on Earth. Areas such as the Valle de la Luna haven’t received a single drop of rain in hundreds of years.

Valle de la Luna (Wikipedia) shown bottom left of this image (Ground level photo)

This bizarre landscape isn’t completely devoid of life however. To the east of the Valle de la Luna lies the village of San Pedro de Atacama, which has developed in the middle of the desert thanks to an oasis. People have been living here for a very long time - the ruins at Aldea de Tulor date from 800 BC.¹

Aldea de Tulor (Ground level photo)

The Atacama Desert is incredibly rich in copper, and the two largest copper mines in the world, Chuquicamata and Escondida are both here. Escondida alone produced 1.483 million tons of copper in 2007 - 9.5% of the entire world’s output.

Chuquicamata (Wikipedia) and Escondida (Wikipedia) copper mines

Mining here hasn’t always been so successful however - the Atacama Desert is littered with the ruins of 170 old abandoned nitrate (or “saltpeter”) mining towns, all of which (bar one) were shut down after the Germans invented synthetic nitrate at the turn of the 20th century.

The most important of these abandoned mines is the Humberstone and Santa Laura Saltpeter Works, and it has actually been designated a UNESCO World Heritage Site.

Thanks to the extremely arid conditions, cloud cover is incredibly rare in the Atacama desert. Combined with the high elevation of the area, that makes it a perfect location for stargazing, which is why there are several observatories here, including at 2,635 metres the Paranal Observatory, that houses the utterly brilliantly named Very Large Telescope (Wikipedia).

Thanks to Bakan_Vargas, Bleij and Tom (and Chris Branagan too).

We’re continuing the first annual GSS Desert Week! We’re mostly posting about deserts and it’s lasting about a week!

The 40 acre Desert of Maine is located in a pine forest near the town of Freeport. Although not a real desert, the “sand” is natural to the area: it is glacial silt that would have been ground down under the earth sometime around the last ice age.

The silt would have remained hidden underground if it wasn’t for some poor farming practices in the early 1900s that eroded all the soil. The farmer eventually had to sell up to an enterprising man who correctly assumed tourists would flock to see some sand in the middle of a forest.

Since 1925 up to 30,000 people a year have visited the “desert”, which is made even more exciting by the inclusion of plastic camels. If that wasn’t enough, there is also a “sand museum” where you can see the sand of real deserts donated from around the world… sounds fascinating!

More info on the official website and NY Times.

Thanks to Elliott C. Evans and jon moses.

We’re continuing the first annual GSS Desert Week! In time-honoured tradition, we’ll mostly be posting about deserts. For about a week.

Whilst not technically a desert, The Great Dune of Pyla (or Pilat), France, is without doubt the largest sand dune in Europe. The dune is around 500m by 3km and up to 117 metres tall, totaling about 60,000,000 m³.

Worryingly, the massive sand dune isn’t content to stay put, and seems hell-bent on swallowing up the forest and anything else that gets in its way. In tandem with coastal erosion, the dune is advancing inland at a rate of around 5 metres a year - which, multiplied by the dune’s length means that up to 15,000m² of forest is being lost every year.

Roads and several houses have already been obliterated by the dune’s progress, and if its progression continues at the same pace, in 40 year’s time the Biscarrosse road and campsite will too have been lost forever.

See the Great Dune of Pyla’s official website for more info (where they also have a good gallery of photos clearly showing the forest being consumed by sand), or read the painfully factual Wikipedia page.

We’re continuing the first annual GSS Desert Week! In time-honoured tradition, we’ll mostly be posting about deserts. For about a week!

The Sahara is probably the world’s most famous desert, and covers much of northern Africa. However today we’re only looking at one tiny part of the desert, in the country of Niger.

It’s not obvious at first, but if you look closely at the top of this sand dune you’ll see what we think is a dust devil (which is like a tornado made of sand).

Sandstorms are common in the Sahara and the walls of sand can reach up to 6,000 metres high. In fact, so much sand is blown up into the air that the Earth has an atmospheric layer made up entirely of Sahara sand!

This image comes to Google Earth as part of the National Geographic Megaflyover project. See all our previous posts for more of the fantastic high-resolution images.

Read more on Dust Devils and the Sahara on Wikipedia.

Thanks to Yvan.

Welcome to the first annual GSS Desert Week! In time-honoured tradition, we’ll mostly be posting about deserts. For about a week!

The Namib Desert in Namibia and Angola forms part of the Namib-Naukluft National Park, and covers an area of 50,000 km². This part of the world has experienced arid conditions for at least 55 million years, which makes the Namib Desert the oldest desert in the world.

The Namib covers much of the Atlantic Ocean coast of Namibia, where the collision of the water-laden sea air and the bone-dry desert air causes immense fogs and strong currents, making this place as notorious for ending the lives of sailors as the more famous Skeleton Coast to the north. There are plenty of shipwrecks to be found in this imagery for those that care to find them!

Away from the coast, this massive desert receives less than 10 mm of rain annually and is almost completely barren, apart from the spectacularly complex dune patterns.

In the eastern part of the desert we find the famous Sossusvlei salt pan, which can sometimes be seen filled with water when a flash-flood fills the Tsauchab river. Note the tourist buses parked in the shade of a tree.

To the south is the Dead Vlei salt pan where even from up here we can spot the “skeletons” of trees which are believed to be about 900 years old - scorched black by the sun and unable to decompose due to lack of moisture.

Perhaps most impressive of all the sights here though, are the mammoth dunes which surround the salt pans. Some of them rise up to 340 metres, which makes them the highest sand dunes in the world.

Check out the photos on Flickr of giant dunes, tree skeletons, and the dunes as seen from in the Dead Vlei.

See Wikipedia for more info on the Namib Desert, the Namib-Naukluft National Park, the Tsauchab, Sossusvlei and the Dead Vlei.

The Arches National Park in Utah, USA, is an area of unique geological formations, most famous for the huge abundance of naturally formed sandstone arches, of which over 2,000 have been formed due to the gradual erosion of the rock.

The most famous of the natural arches here is Delicate Arch, which features on Utah license plates, but unfortunately isn’t all that impressive looking from above.

Landscape Arch on the other hand is impressively big - its span is over 90 metres (300 feet)!

We can also clearly see Natural Arch - it’s the pale saddle shaped one here. I get the impression it’s more awe inspiring in real life!

The National Park features many other fascinating formations, including Balanced Rock, which is described as “a large balancing rock, the size of three school buses”. You can see the shadow of the huge rock in this thumbnail image.

Finally we come to the Fiery Furnace — an area of maze-like narrow passages and tall rock columns which (much like the biblical story from which it gets its name), is easily survivable. As long as you’re on the ranger-guided tour that is.

Also see our older posts on the Rainbow Bridge, Utah and the Devil’s Tower, Wyoming. You can read more about The Arches National Park at Wikipedia or see ground level pictures at Flickr.

Thanks to Cortney Moody, Jeff Alu, Jens Kilian, Jens Kilian, Michael Lustig, Roland Bock, woowoowoo, Jason Wolfe, Stuart and Steve Bryson.