Answer:
These impacts include compaction, loss of soil structure, nutrient degradation, and soil salinity. The effects of soil erosion go beyond the loss of fertile land. It has led to increased pollution and sedimentation in streams and rivers, clogging these waterways and causing declines in fish and other species.
 
        
             
        
        
        
Lake is the large body of water found inland and  usually feed by a stream.
Explanation:
Lake is a water body that is found inland and usually feed by stream or rivers .  Lakes supply drinking water to the cities. Lake plays huge role by providing water to the people which are used for various purpose agriculture, drinking, irrigation. It prevents flood  and during dry season it maintains a flow of water. Lakes are also used for hydel power development.
Lake store water and during shortage it provides water .  Lakes improves water quality as well as increases the groundwater level and also help in preserving biodiversity.
 
        
             
        
        
        
I think it's True.. ((:
http://www.chemguide.co.uk/physical/basicrates/catalyst.html
That might help ^