Explanation:
Geological activity determines geological structures. The prevalent types and forms of tectonic working in a place will control the form of structure that can be found in a terrain.
In volcanic region, it is common to see volcanic structures of different types such as calderas, strato-volcano etc. These structures are formed by the volcanic activities. Also, in a karst topography, we find sink holes, stalactites and stalagmites etc. due to the nature of the geologic activities going on. Some sedimentary rocks shows cross bedding due to the environment where they form.So, geologic activities controls the structure found in an area