What are the common causes of unconformities?

Unconformities are gaps in the geological record that occur due to various processes. Common causes include erosion, where existing rock layers are worn away by wind, water, or ice, and non-deposition, where sediment fails to accumulate over time. Additionally, tectonic activities can uplift and fold layers, leading to their exposure and subsequent erosion. Lastly, changes in sea level can result in periods where sedimentation halts, creating gaps between rock layers.