Abstract
Forces which cause the change of landforms are divided into three: (1) endgene force, (2) exogene force, and (3) human force. In the ancient time, when human culture was yet low, man lived in adapting to the conditions of natural environment, and did not change landforms in a great amount. But in the recent years, human forces are conspicuous to change landforms: such as, upheaval of river-beds by riparian works; deposition of sand and gravels in artificial lakes by construction of dams; land subsidence in industrial areas by puming up of ground water. In the ice age, valleys in mountains of Northern Japan were covered by peri-glacial block streams, but in the post-glacial age, these block streams are covered by dense forest. When we cut the forest for various purposes, the underlying block streams seems to begin to move and become the cause of natural hazard of land-slide.
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