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A fireplace or hearth is a structure made of brick, stone or metal designed to contain a fire. Fireplaces are used for the relaxing ambiance they create and for heating a room. Modern fireplaces vary in heat efficiency, depending on the design. Historically, they were used for heating a dwelling, cooking, and heating water for laundry and ...
Fire glass (also fire pit glass, fire rocks, fire beads or lava glass) is a type of tempered glass, chunks of which are used decoratively on fireplaces. Pieces of the glass are heaped around jets of burning gas, or around liquid ethanol , in order to conceal the jets and reflect the flames. [ 1 ]
The Narragansett Runestone, also known as the Quidnessett Rock, [1] is a 2.5 t (2,500 kg) slab of metasandstone located in Rhode Island, United States. It is 5 (1.5m) feet high and 7 feet (2.1m) long. [ 2 ]
Monolith with bull, fox, and crane in low relief at Göbekli Tepe. The density of most stone is between 2 and 3 tons per cubic meter. Basalt weighs about 2.8 to 3.0 tons per cubic meter; granite averages about 2.75 metric tons per cubic meter; limestone, 2.7 metric tons per cubic meter; sandstone or marble, 2.5 tons per cubic meter.
Stone tools have been used for millions of years by humans and earlier hominids. The Stone Age was a period of widespread stone tool usage. [39] Early Stone Age tools were simple implements, such as hammerstones and sharp flakes. Middle Stone Age tools featured sharpened points to be used as projectile points, awls, or scrapers.
Rocks from the Bishop tuff from California, United States, uncompressed with pumice on left; compressed with fiamme on right The caprock in this photo is the ignimbrite layer of the Rattlesnake Formation in Oregon. Ignimbrite is a type of volcanic rock, consisting of hardened tuff. [1]
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