Permafrost is soil that remains frozen for at least two consecutive years.

Permafrost is found in Arctic and subarctic regions, Antarctica, and high mountain regions.

The average temperature of permafrost is -10°C (14°F).

Permafrost can be up to 100-200 meters (330-660 feet) thick.

Climate change is the main cause of permafrost melting.

Permafrost melting can lead to the release of greenhouse gases, damage to infrastructure, and changes in plant and animal life.

We can protect permafrost by reducing greenhouse gas emissions, protecting wetlands and forests, and using sustainable construction methods.

Roads are the most common type of infrastructure built on permafrost.

The main challenges of building infrastructure on permafrost are that it is unstable, cold, and wet.

We can build infrastructure on permafrost safely by using special foundations, insulating buildings, and using permafrost as a building material.

Permafrost melting can damage infrastructure, and infrastructure can accelerate permafrost melting.

The future of infrastructure on permafrost is impossible to predict.

The Trans-Alaska Pipeline, the Dalton Highway, and the Prudhoe Bay oil field are all examples of infrastructure that has been built on permafrost.

Engineers face a number of challenges when building infrastructure on permafrost, including its instability, coldness, and wetness.

Engineers can overcome the challenges of building infrastructure on permafrost by using special foundations, insulating buildings, and using permafrost as a building material.