Explain how a swallow hole is formed

He swallow hole has been formed as the result of chemical weathering along a joint in the limestone bedding plane. Resurgence - when water flows down a swallow hole it fllows underground along bedding planes and down joints.

Water passes over limestone and erodes vertical joints to then form swallow holes. The hole has been formed because of the result of chemical weathering along the joint in the limestone bedding plane.

Geothermic gradient is the rate of increasing temperature with respect to increasing the depth in the earths interior. away from tech tonic plates boundaries, it is about 25-40 c/km (72-87 degrees f/mi) of depth near the surface in most of the world.