Final answer:
Carlisle is built on the floodplain of the River Eden, a low-lying area less than 100m above sea level. Over time, the meandering of the river and the deposition of sediment have caused the floodplain to widen.
Step-by-step explanation:
Carlisle been built on the floodplain of the River Eden. A floodplain is a flat or gently sloping area of land adjacent to a river that is prone to flooding during periods of high water flow. In the case of Carlisle, this floodplain is formed by the River Eden. The land in this region is relatively low-lying, with elevations less than 100 meters above sea level.
Over time, the river's natural processes, including meandering, have caused the floodplain to widen. Meanders are bends or curves in a river's course. As the river meanders, it may erode the banks on the outside of the curve and deposit sediment on the inside, contributing to the migration and widening of the floodplain.
Additionally, during periods of flooding, the river can carry and deposit sediments across the floodplain. This sediment deposition plays a role in building up the floodplain over time. The combination of meandering and sedimentation processes has influenced the landscape of Carlisle, making it a part of the broader floodplain of the River Eden.