Railways are the most important means of passenger transportation in Japan, maintaining this status since the late nineteenth century. Government policy promoted railways as an efficient transportation system for a country that lacks fossil fuels and is nearly completely dependent on imports.
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Answer:
Renewal of Wetlands. Floods contribute to the health of ecologically important wetland areas. ...
Returning Nutrients to Soil. Floods distribute and deposit river sediments over large areas of land. ...
Preventing Erosion and Maintaining Land Mass Elevation. ...
Recharge and Replenish Ground Water.
The answer is a political system
