*** Mini-Challenge 445 - Rock - Stone - Crystal ***



Not certain this is a real slab of rock, but I hope it's is.

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A type of granite. Definitely a rock
 
Iceland's south shore has an amazing mixture of rock types and formations due to volcanic, glacial and erosion forces.

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For scale; the cavern is about 4ft tall by 3 ft wide.
 
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Another shot from Iceland showing a small pool and drop river.



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Icelandic lava tube form when the surface of a lava flow freezes and the molten centre drains out. This one is said to be kilometres long, although at places it becomes quite narrow. Access is restricted to the first couple hundred metres for preservation and safety reasons though.



The entrance is about 10 metres below ground level.
The entrance is about 10 metres below ground level.
 
Stalactites along a cliff in the Amalfi Coast.

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After having viewed hundreds of sculptures in Florence and Rome, you might guess what these 3 to 6 foot long formations reminded me of ;)
 
Can't compete with the Grand Canyon but anyway---



The Atlantic Slabs
The Atlantic Slabs

Millions of years ago this was part of a sandy sea-bed in the tropics. Now it forms part of a 2700 foot- high mountain in Snowdonia National Park in North Wales.



Next we have the view looking the other way--



Looking at Tryfan (3010 feet) from Carnedd y Filiast. To the right is the Bristly ridge - a Grade 1 scramble- leading to Glyder Fach.
Looking at Tryfan (3010 feet) from Carnedd y Filiast. To the right is the Bristly ridge - a Grade 1 scramble- leading to Glyder Fach.



And now to the Isle of Angelsey off the North Wales coast to see how our ancestors used stone--



Din Llugwy
Din Llugwy

This village dates back to the 4th century AD when the locals lived here during the time of the Roman Occupation. The roofs would have been made with a combination of timber, thatch ,and turf, with a hole in the top for the smoke from the fire to escape. They were tough in those days!
 
Volcano on the Big Island; Hawaii



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The third one is very nice, thanks for posting.
 


Shot with a Nikon D40 I tried out. Using that camera for a few weeks made me buy a 450D. :-)
What's the story on this? Is the fencing protecting something historic?
I can't remember much about it, my photographer's eye took over and nothing much else of the context got into my memory. I guess it was part of a retaining wall or something like that, maybe the wire was there to stop the stones falling out, but I really don't know, sorry.

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Thank you Baker123!
 
Rock fences are pretty common along roads in the Rocky Mountains in the United States. They inhibit large rockfalls onto the roads
 
Half Dome, the world's largest granite monolith.
Half Dome, the world's largest granite monolith.

If you view at 100%, you can see hikers who came by way of the cable on the overhang at upper left.

"The single most important component of a camera is the twelve inches behind it." Ansel Adams
www.pbase.com/rjgjr
 
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