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Home > Images Dated > 2007 > August > 14 Aug 2007

Images Dated 14th August 2007

Choose from 25 pictures in our Images Dated 14th August 2007 collection for your Wall Art or Photo Gift. All professionally made for Quick Shipping.

DH-4393 Featured 14 Aug 2007 Image


Near Well 23 Canning Stock Route a very remote part of Western Australia.
Geodes form from expansion of an initial cavity filled with fluid, often a salt solution. Chalcedony, from silica gel, then forms on the edges of the cavity. This isolates the salt solution. If the surrounding water is less salty, then the internal salinity, though osmosis, creates outward directed pressure and the geode expands until equilibrium is reached. Crystallisation and dehydration of the silica gel leads to cracking, and sometimes, to entry of mineral-bearing fluids. These fluids may precipitate minerals leading to geodes which are completely crystallised (infilled with crystals). Sometimes, the term geode is applied to any spherical cavity within rocks, but strictly speaking, it should only be applied to the above rocks.
Don Hadden

© Don Hadden /

Baikal / Nerpa Seal - endemic to lake Baikal Featured 14 Aug 2007 Image

Baikal / Nerpa Seal - endemic to lake Baikal

Baikal / Nerpa Seal - endemic to lake Baikal
lake Baikal Russia
Phoca sibirica
Latin formerly know as Pusa sibirica
Masahiro Iijima
Please note that prints are for personal display purposes only and may not be reproduced in any way

© Masahiro Iijima/

Endemic, Frozen, Habitat, Habitats, Ice, Landscape, Landscapes, M Ammals, Mammal, Marine, Pinniped, Pinnipeds, Russia, Russian, Seal, Seals, Snow, Water, Wild Life