Sentences with phrase «volcanic tuff»

Volcanic tuff refers to a rock formed from volcanic ash and fragments that have been compacted and hardened over time. It is a type of sedimentary rock, commonly found near volcanic areas. Full definition
Coarse chunks of volcanic tuff and brick compose about 45 - to -55-percent (by volume) of the concrete.
Ethiopian King Gebre Mesqel Lalibela ensured his name would always be uttered with awe, when he commissioned 11 interconnected monolithic churches and two chapels to be carved out of red volcanic tuff in the 12th century at his birthplace in the northern reaches of his...
Water - based rain dates back to at least the late Archaean Eon: Researchers have found fossilized raindrop imprints in 2.7 billion - year - old volcanic tuff in South Africa.
The specimen was originally thought to be around 2.9 myr old, due to an inaccurate dating of 2.6 myr for the KBS volcanic tuff located above it.
What it lacks in speed, it more than makes up for in scenic splendour, passing by fascinating slate and volcanic tuff rock formations and then across the Brohl valley via a viaduct 120 metres long and 12 metres high.
To arrest erosion caused by wind and rain, a trass mortar achieved mixing volcanic tuff (trass) with lime, is compacted every 8 layers of earth directly in the formwork.
Typically, this consists of two wall coverings assembled with roughly placed stones of volcanic tuff (opus incertum), together with a core of smaller stones set in a lime - mortar grout (opus caementicium).
In the first six months, waves rapidly eroded the volcanic tuff, hardened ash that forms the island's central cone.
For underwater structures, lime and volcanic ash were mixed to form mortar, and this mortar and volcanic tuff were packed into wooden forms.
While they admit the dating of the volcanic tuff was inaccurate, F. Fitch and colleagues claim that the depth of the specimen beneath the tuff shows a much earlier age, daing to around 2.4 myr.
William Beebe visited the islands and makes mention of them in his book Galapagos: World's End, he described the cliffs as majestic and made of stratified layers of volcanic tuff.
Daphne is a volcanic tuff cone, formed by successive explosions produced by the mixture of lava and water.
This property is within walking distance to all of Waikiki's main attractions, including Diamond Head (a volcanic tuff cone), the Honolulu Zoo and the Waikiki Aquarium.
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