Which of these describes the viscosity
of water at room temperature?
a. water has no viscosity at room temperature.
b. viscosity is not a property of water.
c. water has a low viscosity at room temperature.
d. water has a high viscosity at room temperature.

all these collisions do one thing, and that thing is explained in the last option. when dusst, rocks and ice collide, they harden and form giant layers of rocks or hard ice.

d)   to harden materials to form different parts of earth’s layers

hope it ,

bioteacher101