What type of weathering happens on gravestones?
Expansion-Contraction Weathering is also known as exfoliation or delimitation of the gravestone, and is caused by the expansion of the stone itself in the heat, and the contraction of the stone in cold. This is particularly an issue in modern cemeteries with sprinkler systems (NCPTT 2018).
What causes gravestones to turn black?
The reason is most likely algae, lichen, moss, mold, or mildew growth and stains. These growths develop on the surface, making headstones and memorials look dark and dirty.
Why do graves have Footstones?
The footstone may simply mark the foot of a grave, serving as a boundary marker for the grave plot, but more often provide additional information about the interred decedent. A footstone usually contains the initials of the person whose grave it marks.
What are types of weathering?
Weathering is the breakdown of rocks at the Earth’s surface, by the action of rainwater, extremes of temperature, and biological activity. It does not involve the removal of rock material. There are three types of weathering, physical, chemical and biological.
Why are tombstones in a cemetery useful for comparing rates of weathering?
Why are tombstones in a cemetery useful for comparing rates of weathering? Slate tombstones carved in the 1700s are less weathered and easier to read then marble gravestones from the 1800s. Some kinds of rocks weather more rapidly. The most important factors of weathering is the type of rock and the climate.
What does a rock on a grave mean?
The usual explanation for this custom is that, unlike flowers, rocks are permanent, so they remain on the grave as a memento forever, and symbolize that you will never forget the deceased.
What can cause the slowly breaking down and turning into blackish color of gravestones?
Black crusts can be deposited on sandstone gravestones. These result from the deposition of particulate matter such as soot, but can also form by the reaction of sulfur dioxide and calcium carbonate that may be present. Carving a surface can produce micro-environments that might enhance weathering.
What happens when rainwater weathers the gravestone?
It particularly affects limestone, chalk and marble rocks. Rain wa- ter gets into joints or weaknesses and widens the gaps, often causing blocks to fall off. The sur- face of limestone or marble recedes gradually, because the calcium carbonate is being removed by rainwater.
What factors might influence the rate of chemical weathering of gravestones?
Rainfall and temperature can affect the rate in which rocks weather. High temperatures and greater rainfall increase the rate of chemical weathering.
How do you clean weathered headstones?
Mix: Non-ionic detergents are generally recommended for cleaning granite headstones. Mix just one-ounce of non-ionic detergent to 5 gallons of water. Apply: Use a brush to gently apply the cleaning solution. Always test the solution to ensure the best results after the area has dried.
Can headstones be resurfaced?
Resurfacing a headstone is no small task. In the event that your loved one’s headstone requires professional resurfacing, there are a variety of businesses that specialize in resurfacing headstone materials with meticulous care and precision.