Permafrost (noun)

1. Soil or rock that remains frozen for more than two years.
2. Ground that is permanently frozen in areas where the temperature is below freezing point.

Origin:

The word "permafrost" is a compound word formed by combining "perma" meaning "permanent" and "frost" meaning ground that is frozen solid. it refers to soil or rock that remains frozen for more than two years.

Examples:

1. Permafrost is found in many Arctic and Antarctic regions.
2. The permafrost is melting due to global warming.
3. Many infrastructure projects in permafrost areas require special design to account for the shifting ground.
4. Permafrost is a significant carbon sink, and its melting could release large amounts of greenhouse gases.
5. Permafrost is also a rich source of mineral resources, such as gold and diamonds.