Rock of Ages - National Botanic Garden of Wales - 500 - Ordovician Rhyolite Lava : 無料・フリー素材/写真
Rock of Ages - National Botanic Garden of Wales - 500 - Ordovician Rhyolite Lava / ell brown
| ライセンス | クリエイティブ・コモンズ 表示-継承 2.1 |
|---|---|
| 説明 | A visit to the National Botanic Garden of Wales. Near Llanarthne in Carmarthenshire, Wales.Rock of Ages / Craig yr Oesoedd.Additional website here The history of Wales in StoneThe Rock of Ages is an outdoor display of the major rock types of Wales.Spanning over 300 million years of Welsh history, it runs alongside the Broadwalk at the National Botanic Garden of Wales.500 million years oldOrdovician Rhyolite LavaThe volcanic lava that came to be these rocks contains a lot of silica. Because of this, the lava flowed slowly, frequently crystalizing before leaving the volcanic vent.Under the influence of increasing pressure the volcano would explode, throwing blobs of lava as well as clouds of dust, ash and gasses into the atmosphere. The eruption of Mount St. Helens in the USA happened in this way in May 1980. When the hot fragments collected together, the load was welded, forming a rock known as ash-flow tuffs.This silica-rich rock and its angular fragments, weathers slowly and produces very acidic soils, of little use to farmers but great for heather Calluna vulgaris. |
| 撮影日 | 2015-06-09 11:57:08 |
| 撮影者 | ell brown , Birmingham, United Kingdom |
| タグ | |
| 撮影地 | Llanarthney, Wales, United Kingdom 地図 |
| カメラ | FinePix S2980 , FUJIFILM |
| 露出 | 0.001 sec (1/1500) |
| 開放F値 | f/8.0 |