擦さっ痕こん

noun

stria; glacial striation

Geological term for scratches or grooves carved into bedrock by glacial movement or similar processes.

• 氷ひょう河がが岩がん盤ばんに残のこした擦さっ痕こんが観かん察さつできる。

  You can observe the striae left on the bedrock by the glacier.