1.   Downed timber used to clog river channels on the Snake, slowing the water and creating still pools that are important trout habitat.

2.   Quakes can shake loose particles and debris that clog rock channels that feed water to a geyser.

3.   The memo stressed the need to refer cases to the resolution process at the first sign that normal channels were clogged.

4.   There, winds can clog channels with ice.

5.   Wholesale distribution channels had been clogged and prescription trends had been misinterpreted.

6.   He said the cause of the low-level explosions is lava which clogs channels within the volcano.