Sinkholes are common where the rock below the land surface is limestone, carbonate rock, salt beds, or rocks that can naturally be dissolved by groundwater circulating through them. As the rock dissolves, spaces and caverns develop underground.
Sinkholes are formed when the land surface above collapses or sinks into the cavities or when surface material is carried downward into the voids. Drought, along with resulting high groundwater withdrawals, can make conditions favorable for sinkholes to form.
Wind and erosion overtime
Bands of soft rocks like clay and sand are very weak in which they can be eroded very quickly. Since cliff and coastline doesn't erode at the the same pace, an inlet of the sea to where the land curves inward forming a bay. Once soft rocks are eroded inward, the hard rocks are able to stick to the sea to form a headland
1. <span>Sahel
2. </span><span>Kalahari
3. </span><span>Mount Kilimanjaro
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