People have stepped on me, but not many. I never stay full for long. I have a dark side. What am I?

Distance that lewis and clark traveled from st. louis to ft. clatsop near the pacific ocean.

What is an additional type of erosion found at the coast? what does it mean?

The graph shows the number of employed workers in the united states in nonfarm jobs from 2008 to 2013. the best conclusion that can be drawn from the graph is that the number of nonfarm jobs remained consistent over time. started going down in 2008. went up every year since 2008. started going down in 2010.