Many of the geological features on the surface of this planet has been shaped by ancient glaciers.
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Ice, however, is not hard enough to cut through a rock.
This impressive groove is 400-feet long, 35-feet wide, and up to 10-feet deep.
The grooves were under several feet of soil before they were dug out in the 1970s.
It was called the Great Grooves.
Unfortunately, active quarrying in the area destroyed most of the grooves.
The remaining grooves are now protected and fenced in, although open for public.
The old rock quarry is still visible behind the Glacial Grooves State Memorial.
Sources:Wikipedia/StateParks.com/Science With Kids
