Scoopers are deeply disturbed individuals who had difficult childhoods. And then there are scrapers. They use the flat of the knife to scrape off their butter, smoothing out the unsightly wreckage left by a scooper and leaving the world a more harmonious place than they found it.
Glaciers are scoopers.
Glaciers gouge out those whacking great U-shaped valleys complete with truncated spurs and hanging valleys and other stuff dear to the hearts of geography teachers. Ice-sheets are scrapers, filing their way across the landscape and smoothing off the lumpier bits. Shetland has been the home of ice-sheets of late. There are few deep lochs in the islands, no Nessies lurking in unimaginable depths. The lochs of Shetland can be embarrassingly shallow.