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  1. Sinkhole - Wikipedia

    A sinkhole is a depression or hole in the ground caused by some form of collapse of the surface layer. The term is sometimes used to refer to doline, enclosed depressions that are also …

  2. What is a sinkhole? | U.S. Geological Survey - USGS.gov

    A sinkhole is a depression in the ground that has no natural external surface drainage. Basically, this means that when it rains, all of the water stays inside the sinkhole and typically drains into …

  3. Sinkholes: What They Are, How They Form, And Their Potential …

    Mar 9, 2025 · Sinkholes are sudden depressions or holes that appear on the Earth’s surface when the ground collapses. These phenomena can cause significant damage to infrastructure and …

  4. Sinkhole Facts - Science Notes and Projects

    Mar 12, 2025 · Get sinkhole facts in geology. Learn about the different types of sinkholes, how they form, and how to repair or escape from one.

  5. What causes a sinkhole to form? - National Geographic

    Sinkholes typically form when naturally acidic rainwater erodes underlying bedrock, creating damage beneath the surface. Their formation is most common in easily erodible karst terrains …

  6. Sinkhole - National Geographic Society

    Jul 3, 2024 · A sinkhole is a hole in the ground that forms when water dissolves surface rock. Often, this surface rock is limestone, which is easily eroded, or worn away, by the movement …

  7. What Causes Sinkholes? | Formation, Water, Limestone, & Facts

    3 days ago · When the structural integrity of the surface above these areas is compromised, it can collapse, creating in a sinkhole. This natural process is relatively common in areas with karst …

  8. What causes sinkholes, and why are they so dangerous?

    Dec 4, 2024 · A sinkhole is a hole or deep depression in the ground that opens up when layers of certain types of rock – usually limestone, carbonate rock and salt beds – dissolve beneath the …

  9. Sinkholes and Their Hazards - InterNACHI

    Natural sinkholes are formed when sub-surface rock dissolves to create underground cavities. They are most often found where the rock below the land surface is limestone, dolomite, …

  10. What Are Sinkholes and How Do They Form in Our Landscape

    A sinkhole is defined as a depression or hole in the ground caused by the collapse of a surface layer. They are particularly common in regions with karst topography, where the bedrock is …