context: The settlement received its name from a small river flowing among the marshy, covered with thick sedge shores: its waters were always muddy, dark, since sunlight hardly penetrated through a dense, barely passable forest. For this, the peasants called Chernushka [2].
question: Why does the city in the south of Perm region in the Russian Federation Chernushka have such a name ??
answers.text: river flowing among the marshy, covered with thick sedge shores: its waters were always muddy, dark, since sunlight hardly penetrated through a dense, barely passable forest