- Given that the elevation of Rock Creek at the Taft Bridge is 20 ft. above sea level, and its elevation at the point where it enters the Potomac River is at sea level, what is the gradient of Rock Creek between the Taft Bridge and the Potomac River?
- Which of the four landmarks (Lincoln Memorial, Jefferson Memorial, Washington Monument, U.S. Capitol) is at the lowest elevation and will be the first to be impacted by rising sea levels in the future (the Potomac River is tidal at this location and thus highly influenced by sea level)
- a.Lincoln Memorial
- b.Jefferson Memorial
- c.Washington Monument
- d.U.S. Capitol