What are the main natural resources of Estonia?

- Oil shale: Estonia has the largest reserves of oil shale in the world. Oil shale is a sedimentary rock that can be burned to produce electricity.

- Forests: Estonia is covered by approximately 50% of forests. The forests are mostly composed of pine, spruce, and birch trees. The timber industry is an important part of the Estonian economy.

- Peat: Estonia has large reserves of peat, which is a partially decomposed organic matter that can be used as fuel.

- Limestone: Limestone is a sedimentary rock that is used in the production of cement, glass, and other building materials.

- Mineral water: Estonia has several natural springs of mineral water, which is bottled and sold domestically and internationally.