IMPACTS OF EROSION
GRADE 11 GEOGRAPHY
is the process by which land surface is
worn away by the action of water, wind,
ice and gravity
Water, wind, ice & gravity produce various erosion features.
When rain falls, soil gets easily washed away.
Above: land safe from erosion.
Below: land vulnerable to erosion
Farming loosens soil and it becomes vulnerable to erosion agents
EXPECTED EROSION RATES
(TONS/ACRES PER YEAR)
Sedimentation is the process by which the
eroded material is transported and
Water without sediments remains clear.
Sediments turn water into brown.
Raindrop bombards, devastates and loosens soil particles.
Vegetation intercepts and minimizes raindrop impact on soil.
Lake filled up with sediments.
Sediments choke fish, which eventually die.
Sediments block drainage systems which may result in flooding.
Reservoir for storm management choked with sediments.
TASK FOR THE DAY
TASK1: Pupils to assess the impact of soil
erosion and sedimentation on the
Environmental and Economical
aspects in their communities
(pupils to be in groups)
TASK2: Pupils to present their findings
TASK3: Pupils to debate/discuss on their