About 224,000 results
Open links in new tab
  1. Sinkhole - Wikipedia

    A sinkhole is a depression or hole in the ground caused by some form of collapse of the surface layer.

  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. What Causes Sinkholes And Are They Getting More Common?

    2 days ago · What Causes Sinkholes And Are They Getting More Common? When the Earth we expect to be solid suddenly opens up it can feel like it’s dragging us to hell, particularly when …

  4. Sinkhole | Karst, Subsidence & Collapse | Britannica

    Jan 1, 2026 · Sinkhole, topographic depression formed when underlying limestone bedrock is dissolved by groundwater. It is considered the most-fundamental structure of karst topography.

  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. What Are Sinkholes and How Do They Form? - Biology Insights

    Jan 6, 2026 · A sinkhole is a natural geological feature defined as a depression or a hole in the ground that forms due to a collapse of the surface layer. These formations typically lack …

  7. 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 …

  8. 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 …

  9. 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.

  10. 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 …