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In a village called Castanheira in Portugal, there is a "magical" boulder named Pedras Parideiras by villagers, which translates roughly to "fertile stone".

Stone as its name, this stone can really "give birth".

This "stone mother" is a piece of granite with an area of 1 square kilometer. Its appearance looks a little uneven, the surface seems to be inlaid with some 2cm to 12cm small stones, some small stones have been separated from the "parent stone", leaving a dent.

The rugged area is where it gives birth to stones. | aroucageopark in the local 18th century dictionary, people also recorded this magical stone:

"this Pedras Parideiras will spit out pebbles from time to time, leaving a hole in its body."

Today, the stone not only carries folklore about fertility, but also becomes the most representative scenic spot in the local Arouca Geopark. Here, the mystery of the stone's "fertility" has also been solved by scientists.

This is a huge "parent stone" | the Flickr-sized "parent stone" granite is composed of biotite, while it has been found that the small stone "born" is made of quartz and feldspar minerals. Geologists in the Geopark mentioned that the small nodular stones inside the big rocks are obviously more resistant to weathering.

After countless wind and rain, hot summer and winter frost, the outer "mother stone" will gradually be weathered, while its core will gradually emerge, and these small stones look as if they have been "born". Today, these stone children are still preserved in Arouca Geopark. However, geologists also warn tourists not to take these small stones, after all, they will be used for follow-up scientific research.

A small stone that was born. | Flickr stone like Pedras Parideiras is actually a very rare geological phenomenon. Scientists now believe that the cause of stone can be traced back to 8 million years ago, when the melted rock wrapped around these small stones inside, or the melted rock was not evenly mixed, and bubbles appeared inside, and in the process of plate movement, they seemed to turn into a whole stone and returned to the ground, so that people could see this magical phenomenon.

In fact, there is also a cliff that can "produce" stones in Guizhou, China, which is called the raw egg cliff. It is said that every 30 years, the egg cliff will automatically fall off a small stone, and on the egg cliff, there seem to be some small stones crumbling, it seems that they will be "born" soon, and it is also said that the big stone has entered the "due date". ).

It also seems to be a very amazing phenomenon. | Tu Yuan Network, a magical phenomenon, was published in "approaching Science" more than a decade ago, and even denied that it was not a dinosaur egg. However, after understanding the above principle, the principle may be similar.

At that time, the scientists on the program speculated that the "egg" of Egg Cliff was originally nodules buried in the ooze in the deep sea. The sediment above keeps compacting the ooze and nodules, turning them all into rock. After continuous geological movement, they become cliffs, and at different weathering speeds, the nodules, that is, "eggs", are slowly exposed.

How round it is! (? | there are two kinds of network weathering: physical weathering caused by frost, heat and pressure, coupled with chemical weathering such as water and oxygen, they will work together to form different landforms. However, the weathering differences caused by different rock types show us many geological wonders on earth, and the above is one of them.

A spectacle of weathering and erosion. | | geologictimepics |

This is also the product of differential weathering. | Flickr however, differential weathering is only a general way to explain this phenomenon, because each weathering process is so complex that scientists in the Arouca Geopark in Portugal still do not fully understand how these small stones were formed. They are like a unique book about the history of local rocks, which contains magical stories that are still waiting for people to explore.

Reference:

[1] https://pt.wikipedia.org/wiki/Pedra_parideira

[2] http://aroucageopark.pt/pt/conhecer/geodiversidade/geossitios/pedras-parideiras/

[3] https://www.bbc.com/travel/article/20220926-portugals-mysterious-birthing-stones

[4] https://the-earth-story.com/post/169539116739/stones-that-give-birth-castanheira-is-a-small

[5] https://viagens.sapo.pt/viajar/viajar-portugal/artigos/pedras-parideiras-em-arouca-as-pedras-que-tem-filhos-sao-um-fenomeno-unico-no-mundo

[6] http://tech.sina.com.cn/d/2006-03-02/0747855235.shtml

This article is from the official Wechat account: bring Science Home (ID:steamforkids), author: everything Magazine

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