When reading a newspaper you come across the word subterranean?

Subterranean is an adjective that means "located or occurring below the surface of the Earth". It is derived from the Latin word "subterraneus", which has the same meaning. Subterranean environments can include caves, tunnels, mines, and aquifers. They can be found in a variety of geological settings, including mountains, valleys, and plains. Subterranean environments are often home to unique plants and animals that have adapted to the dark, cold, and humid conditions.

Examples of subterranean environments include:

- Caves: Caves are naturally formed openings in the Earth's surface that are large enough for humans to enter. They are often found in limestone, marble, and other types of soluble rock. Caves can be very complex, with multiple levels and chambers. Some caves are home to bats, salamanders, and other animals.

- Tunnels: Tunnels are man-made passages that are dug underground. They can be used for transportation, water supply, or mining. Tunnels can be very long, and some even connect different countries.

- Mines: Mines are underground excavations where valuable minerals are extracted. Mines can be very deep, and some even extend below the ocean floor. Mines can be dangerous, and miners must take precautions to avoid injury or death.

- Aquifers: Aquifers are underground layers of rock or soil that hold water. Aquifers can be very large, and some span entire continents. Aquifers are important sources of water for drinking, irrigation, and industry.

Subterranean environments are often mysterious and unexplored. They can be dangerous, but they can also be beautiful and fascinating.