出典:Wikipedia
出典:『Wikipedia』 (2011/07/07 10:37 UTC 版)
Lavaka, the Malagasy word for "hole",with steep sides usually on the side of a hill is a type of erosional feature common in Madagascar. They are most abundant in the Central Highlands, where there are deep laterites developed on in steep terrain in a monsoonal climate. Lavakas form where hard laterites overlie thick (tens of metres) saprolite, on steep (35 to 55 degree) slopes, in areas that have a hot dry season and a warm wet season.