○○○ slab ⪢⪢
Glaciers are sometimes called 'rivers of ice' because they are huge _____s of ice and snow that move very slowly across the landscape.
http://qindex.info/i.php?x=23836

○○○ creep ⪢⪢
Glaciers crept out of their mountain ranges and down to lower elevations.
http://qindex.info/i.php?x=17394

◌◌◌ Glaciers
National Geographic
http://qindex.info/i.php?x=4014

• glaciers
-- glacier, glacial, freeze-thaw, abrasion, till, chunk, erode, deposit, soak
http://qindex.info/i.php?x=6918

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