Mid-winter ice is thought to precipitate from the atmosphere and mix with rock and soil to form masses that slowly creep downslope under the influence of gravity (rock glaciers).
(Mid-winter ice; is thought; ) (Mid-winter ice; to precipitate; from the atmosphere and mix with rock and soil) (masses; slowly creep; downslope)
Mid-winter ice Mid-winter ice masses
is thought to precipitate slowly creep
from the atmosphere and mix with rock and soil
downslope