1. Rescue crews were working their way through difficult terrain to reach the plane.

2. The terrain and habitat likely play a major role in the distribution of reports.

3. In the West, the rain and rugged terrain could create the potential for flash flood.

4. All this takes place on a simple, lovely little world built on a series of terrain layers.

5. The jacket helped in locating his body in the rocky terrain, the park service reported.