Soil Erosion Types and Causes Questions and Answers

Answer: D

The data not included is Load sampling data.

Planning a watershed improvement project needs hydrological information (rainfall, runoff, stream flow, groundwater), soil and land use data (soil types, depths, slopes, present use and capability) and economic and social data (land holdings, incomes, population and people's participation).

Load sampling refers to measuring sediment or pollutant loads in a stream, which is a monitoring activity rather than one of the standard categories of planning data, so it is the odd one out.

Answer: B

It is Sheet erosion.

Sheet erosion is the removal of a thin, fairly uniform layer of soil from the whole surface by raindrop splash and shallow overland flow. It is hard to notice and often goes unchecked, yet it removes the most fertile topsoil.

Rill erosion cuts small channels a few centimetres deep, gully erosion forms large channels that cannot be crossed by tillage implements, and mass erosion (landslides, slumps) moves large masses of soil at once. None removes a uniform thin layer.

Answer: B

The one that is not a form of water erosion is Fence.

Water erosion is described in stages of increasing severity: raindrop splash, sheet erosion, rill erosion, gully erosion and stream bank erosion.

A fence is a barrier, not an erosion process, so it is the odd one out. Sheet, rill and gully erosion are all standard forms of water erosion.