1. Landforms shaped by subterranean processes:
* Caves and Caverns: These are formed by the dissolving action of acidic water on soluble rock like limestone.
* Karst Topography: A landscape dominated by sinkholes, caves, and underground drainage, often formed by dissolution of carbonate rocks.
* Lava Tubes: Channels formed by flowing lava, often leaving hollow, tunnel-like structures after the lava cools and solidifies.
* Geothermal Features: Hot springs, geysers, and fumaroles, all powered by heat from the Earth's interior, manifest on the surface but originate underground.
* Underground Rivers and Lakes: These can exist in areas with karst topography or other geological formations that allow water to flow and collect below ground.
2. Geological structures found beneath the surface:
* Fault Zones: Fractures in the Earth's crust where rocks have moved past each other.
* Folds: Bends or wrinkles in rock layers caused by compression.
* Intrusive Igneous Rocks: Magma that cooled and solidified beneath the surface, forming structures like batholiths, stocks, and dikes.
* Mineral Deposits: Concentrations of valuable minerals that formed over geological time, often found deep underground.
3. Human-made underground structures:
* Mines: Excavations to extract valuable resources from the Earth.
* Tunnels: Passageways dug through the Earth for transportation, utilities, or other purposes.
* Underground Cities and Shelters: Structures designed to be located below ground level for various reasons like protection, climate control, or resource accessibility.
To give you a more accurate answer, could you tell me what you're interested in specifically? For example, are you interested in landforms that are created by underground processes, or structures that are located underground?
