I read the writing of one tourist attraction below introduced in a Korean website.
"Gotjawal" forests, grow in the center of the Geomunoreum crater. In these forests, nature has carved deep crevices called "sumgol" into the rocks. The crevices act as natural waterways that channel rainwater into the ground. As it penetrates layers of scoria* and basalt**, the water is naturally cleansed of impurities and fortified with minerals.
Q) I couldn't understand what the underlined part meant.
As the water penetrates layers of scoria* and basalt**, these substances naturally remove impurities. The idea is that they act as natural filters.
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As the water penetrates layers of scoria* and basalt**, these substances naturally remove impurities.
The idea is that they act as natural filters.