the limestone harden because theirs another layers of limestone on top of it which pushes the bottom layer and flatten it.
Acids react with the calcium carbonate in limestone to form soluble compounds like calcium bicarbonate or calcium chloride, which then dissolve into water. This chemical reaction causes the limestone to erode and break down over time.
It releases bubbles if carbon dioxide gas.
Buildings made from limestone are affected by sulfur compounds from burning fossil fuels because sulfur dioxide in the air reacts with limestone to form sulfuric acid. This acid causes the limestone to deteriorate by dissolving and weakening its structure through a process known as acid rain.
The opposite of harden is soften.
Acid rain can gradually dissolve and deteriorate limestone structures by reacting with the calcium carbonate in the rock. This reaction can lead to the erosion and eventual breakdown of the limestone, causing damage to buildings, statues, and monuments made from this material. Over time, the acidification process may alter the appearance and structural integrity of limestone surfaces.
sprinkle water on it
Limestone
Arthur Harden died on June 17, 1940 at the age of 74.
ten
Not sure what you mean but A) limestone IS natural anyway, and B) some limestones are relatively soft while in the middle of their unit but harden once quarried and exposed to the air.
Mortar has fine rock called, "Sand" in it. There is also finely pulverized limestone in it that helps harden it.
Arthur Harden died on June 17, 1940 at the age of 74.
Chemical reaction of lime and dehydrated gypsum with water.
its the calcum salts that build up soft tissue and causes it to harden
The compound that causes limestone rock to be yellow in color is iron oxide. Iron oxide can give limestone a yellow or brownish hue due to the presence of iron minerals within the rock.
Keratin... it's a natural substance that makes the nail harden.
Spending too much time on your knees