Template:Potd/2025-11-20 (en)

Geological fieldworks, underground in the Estonian oil shale mine to study the variable mineralogical and chemical composition and microstructure in the different layers of the oil shale profile.

 Template:Potd/2025-11-20

This is the English translation of the Picture of the day description page from 20 November 2025.

Geological fieldworks, underground in the Estonian oil shale mine to study the variable mineralogical and chemical composition and microstructure in the different layers of the oil shale profile.

Descriptions in other languages:

• Potd/2025-11-20 (cs)
• Potd/2025-11-20 (en)
• Potd/2025-11-20 (es)
• Potd/2025-11-20 (eu)
• Potd/2025-11-20 (hu)
• Potd/2025-11-20 (mk)
• Potd/2025-11-20 (pt)