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heuweltjie
Heuweltjies are a class of soil surface feature that occurs widely in the south-western Cape of South Africa. They may be recognised as large mounds above or near the surface of the landscape. Like other similar-looking phenomena, such as Mima mounds and fairy circles, from which they have been poorly distinguished, particularly in early literature, they have been the subject of a wide range of speculation and of debate that has not yet been settled conclusively.
==Causes==
It is quite certain that not all types of heuweltjies have the same cause and nature. For one thing, the various organisms and circumstances that have been proposed to cause them do not occur throughout their range. For another, they differ in nature; some for example have been seen as improving soil fertility, an opinion documented at least as long ago as the early 20th century,〔 whereas others seem to inhibit plant growth. Discussions on the topic include the following.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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