You are hiking in your favorite forest when you encounter a surface that appears to have very fine directional scratches in it. What are these features?

Question

Quizplus · Accepted Answer

Striations are fine directional scratches that are typically left behind on rocks and other surfaces by glacial activity. Glaciers can pick up rocks and debris as they move, which then act like sandpaper on the ground beneath. As the glacier moves across the surface, it leaves behind these fine scratches, or striations, which can be a telltale sign of past glacial activity. Glacial till, moraines, and scour marks may also be present in areas where glaciers once existed, but do not necessarily leave behind the same type of fine scratches that striations typically do.

You Are Hiking in Your Favorite Forest When You Encounter