Subsurface (adjective)

Located below the surface of a substance or body, especially the surface of the earth.

Origin:

The term 'subsurface' is derived from the combination of the prefix 'sub-' meaning 'below' and the word 'surface', referring to something that is located below the surface of a substance.

Examples:

1. Subsurface water is found in underground aquifers.
2. The subsurface rock formations are rich in minerals.
3. Subsurface imaging is used in oil and gas exploration.
4. Subsurface mining is a method of extracting minerals from beneath the earth's surface.
5. The subsurface layer of soil is important for plant growth.