Why do rock formations have wavy layers?

Wavy layers in rock formations are typically the result of geological processes such as sediment deposition, tectonic activity, and erosion. Over time, sedimentary layers accumulate and can be affected by forces like folding due to tectonic movements, which cause the layers to bend and undulate. Additionally, variations in sediment composition and environmental conditions during deposition can lead to differences in how the layers respond to these forces. This interplay of geological processes results in the wavy appearance of the rock layers we observe today.