Soil erosion and conservation
Explain how water and wind remove soil and evaluate measures that reduce erosion.
Section 2.4 · Soil erosion and soil conservation
Exam scope and assessment notes
Use this original lesson for the listed 2026, 2027–2028 and 2029–2031 Cambridge syllabus cycles. This route maps Cambridge's 2026 Version 2, 2027–2028 Version 1 and 2029–2031 Version 1 syllabuses. The 2026 update changes only a weblink; Cambridge reports no significant teaching changes for the 2027–2028 or 2029–2031 cycles. Exams are in the November series, and the qualification is not available in every administrative zone; confirm entry with your centre. Centre-selected local crop, weed, pest, disease and livestock examples must be checked against local agriculture. StudyForA does not replace supervised, risk-assessed practical work, the four assessed practical exercises, the individual practical investigation/report, teacher assessment or Cambridge moderation. Online practice is not an official mark or grade.
Before you begin
- Read the syllabus that matches your exam year and confirm your centre can enter you for code 0600. This route maps Cambridge's 2026 Version 2, 2027–2028 Version 1 and 2029–2031 Version 1 syllabuses. The 2026 update changes only a weblink; Cambridge reports no significant teaching changes for the 2027–2028 or 2029–2031 cycles. Exams are in the November series, and the qualification is not available in every administrative zone; confirm entry with your centre. Centre-selected local crop, weed, pest, disease and livestock examples must be checked against local agriculture. StudyForA does not replace supervised, risk-assessed practical work, the four assessed practical exercises, the individual practical investigation/report, teacher assessment or Cambridge moderation. Online practice is not an official mark or grade.
Work on paper. Try each question before revealing help, and explain why your method works.
Quick readiness check
Which change is most likely to reduce soil exposure to raindrop impact?
What you will learn
- Identify erosion agents and causes.
- Connect erosion to land cover, slope and soil condition.
- Compare prevention and control measures.
Trace soil loss
Water erosion can occur as splash, sheet, rill or gully erosion; wind can detach and transport exposed particles. The agent and form depend on rainfall, wind, slope, soil and surface cover.
Removing vegetation, overgrazing, frequent cultivation, bare soil and poorly planned drainage can raise risk. Lost topsoil may reduce rooting depth and nutrients, while sediment can affect waterways.
Reduce detachment and slow movement
Cover crops, mulching, contour cultivation, strip cropping, windbreaks, terraces, managed grazing and maintaining organic matter can reduce exposure or slow runoff. Choice depends on slope, climate, crop and labour.
A measure may shift rather than remove risk. For example, a barrier must be maintained and safely direct water; local design should follow qualified guidance.
Sources for this lesson
Pause and explain
Which change is most likely to reduce soil exposure to raindrop impact?
Worked example
After vegetation is removed from a sloping field, muddy runoff reaches a stream. Explain the pathway and suggest two controls.
Show the worked solution
- Bare soil is exposed to raindrop impact and runoff; water carries detached particles downslope.
- Sediment reaches the stream and can increase turbidity or cover aquatic habitat.
- Ground cover and contour-aligned barriers may reduce detachment and slow runoff, if suited to the site.
Answer Vegetation loss exposes soil, runoff transports it and the stream receives sediment. Ground cover and contour measures can reduce risk, but the design must fit the slope and drainage.
Try a topic test
Choose Easy, Normal or Difficult. Save your answers and open worked review after finishing.
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Write your answer and reasoning first. Use a hint only if you are stuck. The model solution is for self-checking; your written work is not automatically marked.
Explain how a windbreak can reduce wind erosion and identify one condition that affects its usefulness.
Give me a hint
Connect reduced wind speed near the surface to particle movement.
Compare my reasoning
- A suitable windbreak slows wind over part of a field.
- Lower wind speed can reduce detachment and transport of exposed soil particles.
- Placement, gaps, maintenance, crop layout and the prevailing wind affect performance.
A maintained windbreak reduces wind speed and can limit soil movement. Its location and design matter, and it does not replace soil cover.
Look for these in your work
- Wind mechanism explained
- Soil movement linked
- A design condition included
Compare mulching with contour cultivation for a field on a slope with intense seasonal rain.
Give me a hint
Consider how each measure changes soil exposure or runoff direction.
Compare my reasoning
- Mulch protects the soil surface and can reduce raindrop impact, but material and crop-management needs matter.
- Contour cultivation can slow downslope water movement, but layout and drainage must suit the land.
- Combining methods may work, but monitor runoff and avoid directing water toward unsafe areas.
Mulch protects the surface; contour cultivation can slow runoff. A combined, site-appropriate approach may help, but local drainage and maintenance matter.
Look for these in your work
- Both mechanisms explained
- One limitation for each
- Site conditions considered
A farm has gullies forming below a track. Outline an investigation before choosing an erosion control.
Give me a hint
Map where water starts, how it travels and whether the track is concentrating runoff.
Compare my reasoning
- Record slope, soil, vegetation, rainfall timing and the location and dimensions of gullies.
- Trace runoff from the track and nearby surfaces, including drainage outlets.
- Choose a supervised control based on the cause, protect downstream areas and monitor after rain.
A useful investigation traces the water pathway and observes the gullies before choosing a control. The response must address concentrated runoff as well as exposed soil.
Look for these in your work
- Site observations planned
- Runoff pathway traced
- Control linked to cause
Common mistakes
- Calling deposition the agent of erosion
- Assuming terraces suit every field
- Treating downstream sediment as unrelated to upstream land use
What can you explain now?
Which change is most likely to reduce soil exposure to raindrop impact?
Compare with the explanation
Maintaining suitable ground cover
Cover reduces direct raindrop impact and can slow runoff.
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Make it stick
Name two erosion agents and explain how one conservation measure reduces soil movement.
If you needed the solution, close it and solve the problem again from a blank page. A correct answer is stronger when you can explain the reason for each step.