What is a key feature of coastal zones in terms of permeability?

In coastal zones, a key feature is the high permeability associated with the sediment and soil types found in these areas. Coastal environments often include sandy beaches and alluvial deposits that allow water to flow through them quite easily. This high permeability is essential for processes such as drainage, the movement of groundwater, and the ability of these areas to filter pollutants.

Additionally, coastal zones typically experience significant tidal influences and wave action, which contribute to the mixing of saltwater and freshwater, affecting soil and water chemistry but often resulting in a balance that allows for ecosystems to thrive. However, the assertion regarding pH content specifically highlights that many coastal waters may lean toward a lower pH due to the mixing of various waters and a variety of biological processes.

Moderate permeability can exist in some coastal environments, but high permeability reflects more accurately the general characteristics of many sandy and unconsolidated coastal areas, thus reinforcing the reasoning behind the high permeability with low pH content as being a fitting description of coastal zones.