Which of the following is an example of a slow geological change?

• A. Formation of caves
• B. Landslides
• C. Tsunamis
• D. Volcanic eruptions

Answer: (A)

Slow vs rapid geological changes show how Earth reshapes itself over different timescales. The formation of caves happens gradually: mildly acidic water dissolves limestone, slowly widening cracks into caverns over long periods, and mineral-rich water drips build stalactites and stalagmites over ages. In contrast, landslides, tsunamis, and volcanic eruptions involve sudden energy release or rapid movement, reshaping the landscape quickly. Because caves develop through extended chemical and mineral processes, they illustrate a slow geological change.