This cache is about the different land forms that can be seen.
EDUCATIONAL LOGGING REQUIREMENTS
In order to substantiate your visit and comply with the educational requirement for Earth Caches you have to submit your answers to the following questions to the cache developers via their profile:
For purposes of logging this cache you must answer the following four questions.
1) To the East of the GZ is a land form. What land form is this? How many are there?
2) Are they identical in shape?.
3) How do you think the hills concerned were formed. Just give the heading from the notes below.
4) What is the number on the milestone at the GZ
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Conical hills or mountains occur in different shapes and are not necessarily geometrically-shaped cones; some are more tower-shaped or have an asymmetric curve on one side. Typically, however, they have a circular base and smooth sides with a gradient of up to 30°
The feature you are looking at is known as Pramberg.
Conical hills can be formed in a number of different ways:
Volcanic cone
All stratovolcanoes and shield volcanoes have a tendency to form a cone at the surface. However, stratovolcanoes are able to form steeper sides whilst shield volcanoes only form very flat cones. The reason for this is that stratovolcanoes are composed largely of solid, eruptive material, whereas shield volcanoes are built up mainly by fluid lava flows.
Over the course of time, after several eruptions, a cone of debris forms from the eruptive material. The natural conical shape so formed is simply a result of the fact that the amount of ejected material decreases with the radially distance from the crater. The layer of debris deposited is greater near the volcano than further away, so the volcano grows more rapidly close to the crater itself. The slope gradient of the resulting volcano is dependent both on the angle of repose as well as the speed at which the volcano is weathered. The angle of repose is, in turn, dependent on the composition of the lava, its viscosity and rate of solidification, and also the amount of ejected loose rock.
Karst cones
Conical hills may form in tropical karst regions, such terrain being known as kegelkarst. A typical example of non-volcanic conical hills are the Chocolate Hills in Bohol on the Philippines.
Erosion-formed cones
In almost all mountain regions of the world, conical peaks may be formed by erosion processes, but they are not usually isolated landforms. Often they arise through the formation of ordinary riverine meanders. But they can also result from the action of an entrenched river that has cut deeply into a plateau. The resulting cutoff meander spur may be cone-shaped.
Artificial cone hills
The artificially created hills or mounds associated, for example, with mining also tend to be cone-shaped. These artificial hills are also free-standing and, once tipping has finished, they may become conical hills overgrown with vegetation. However, as artificial features they are classed as spoil tips rather than natural hills.
References
Gavin Whitfield. 50 Must-See Geological sites in South Africa.
Wikipedia