"the rock surface in this photo has been eroded by a glacier. the erosive pattern shows long, parallel grooves in the rock that are called"

Striations- As they are the scratches and  erosive patterns which are formed on the bed rock due to the glacial abrasion."

Explanation:

Now, in the early times or many millions years ago the glacial layers passed through different regions of the land, leaving marks behind. Some of these marks can be analyzed as the parallel grooves in the rock called as striations.

The glacial abrasion is the process during which the bottom rocks are glided over the layer of the land, creating different patterns on it called as striations.

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