"Permanganic" Natural Recordings by Native Speakers
Permanganic refers to a compound that contains manganese in its highest oxidation state, specifically manganese in the oxidation state of +7. In chemistry, permanganic acid (HMnO4) is a powerful oxidizing agent used to oxidize a wide range of organic and inorganic compounds.
Permafrost refers to a type of soil or rock that remains frozen for two or more consecutive years. It is commonly found in Arctic and sub-Arctic regions, where temperatures are typically below freezing for long periods of time. Permafrost can be hundreds or even thousands of years old and can be several meters thick. It is formed when the ground remains frozen for a long time, causing the soil and underlying rock to become compact and rigid. Permafrost plays an important role in the ecosystem, providing habitat for certain plants and animals that are adapted to the frozen conditions.