How do you suppose the ice of glaciers could cause deep scratches and grooves in bedrock that is harder than ice?
Glacial striations or striae are scratches or gouges cut into bedrock by glacial abrasion. Ice itself is not a hard enough material to change the shape of rock but because the ice has rock embedded in the basal surface it can effectively abrade the bedrock.
What is River erosion caused by?
Rivers and streams are dynamic systems as they are constantly changing. The report revealed that the causes of riverbank erosion in the study area were: excessive flood, excessive rainfall, heavy rainfall in the upstream, increase flow of water with high wind, and poor land cover along with the line.
Which state is most affected by river erosion?
In India, among all Eastern and North-eastern states, Assam faces the most severe brunt of Brahmaputra bank erosion. According to the records of the last century, the Assam valley portion of Brahmaputra River occupied around 4000 km 2 in the 1920s, which is now around 6000 km 2 (Phukan et al., 2012).
Why is erosion so bad?
The impacts of erosion on cropping lands include: reduced ability of the soil to store water and nutrients. exposure of subsoil, which often has poor physical and chemical properties. higher rates of runoff, shedding water and nutrients otherwise used for crop growth.
What is the effects of water erosion?
Water erosion causes loss of topsoil, reduced crop yields, damaged infrastructure, weed dispersal, eutrophication (algal blooms) and silting of dams and natural waterways.
What are the disadvantages of water erosion?
The adverse effects of water erosion eventually lead to wildlife. Because the absence of the topsoil reduces water quality and increased pollutants, animals, fish and algae are negatively effected. Excessive topsoil could conceal fish breeding areas and pollute downstream waters.
How can flooding cause more destructive erosion?
Floods cause erosion because the amount of power that the flow of water brings is often sufficient enough to completely tear away top layers of soil. …