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Subjects

Geography

Soil formation processes

In this Class 11 Geography topic from Geomorphic Processes, students learn how soil develops through the weathering of rocks and the gradual interaction of parent material, climate, organisms, relief and time. The topic explains key processes such as the addition and loss of materials, transformation of minerals and the movement of clay and other substances within the soil profile. It also helps students understand soil horizons, profile development and the influence of erosion and drainage on soil formation.

Hard · Level 4 · 25 questions

TOPIC PRACTICE

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  1. River deposits different sized particles under different energy conditions
  2. River deposits only one particle size
  3. Alluvial soil has no particles
  4. River deposition occurs only on mountains
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  1. Because material may have been brought from a distant source
  2. Because it contains no minerals
  3. Because it never becomes soil
  4. Because it is only humus
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  1. Removal of soil by sea waves
  2. Mixing and movement of soil materials by organisms
  3. Lava solidifying on the surface
  4. Valley formation by glacier
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  1. They create sea salts
  2. They melt rock immediately
  3. They can help nutrient absorption
  4. They stop rainfall
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  1. They only carry leaves to the sea
  2. They always stop water
  3. They turn parent rock into salt
  4. They can add root residues and humus deeper down
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  1. Organic matter supply decreases and erosion increases
  2. Rainfall always stops
  3. Parent rock completely disappears
  4. All nutrients immediately increase
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  1. It reduces effective slope length and runoff speed
  2. It ends rainfall
  3. It burns humus
  4. It blows away parent rock
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  1. Granular structure always becomes stronger
  2. Particle arrangement may break and erosion risk may rise
  3. Gold forms in soil every time
  4. Climate influence ends
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  1. Because it also affects colour structure oxidation and root growth
  2. Because drainage has no relation with soil
  3. Because drainage occurs only in seas
  4. Because drainage is only wind direction
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  1. Accumulation remains and erosion is relatively lower
  2. Rock never weathers
  3. Biological activity is impossible
  4. Water entry is always zero
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  1. Leaching never occurs
  2. Humus always forms more
  3. Erosion quickly removes forming material
  4. Climate becomes inactive
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  1. Height of sea waves
  2. Sequence of wind speed
  3. Only rainy season
  4. Profile development from organic surface to parent material
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  1. It forms the basis of the fertile top layer
  2. It forms the ocean floor
  3. It forms only glaciers
  4. It stops soil formation
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  1. Calcium accumulation
  2. Removal of materials by eluviation
  3. Lava solidification
  4. Surface salt crystal
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  1. Because sand rises upward
  2. Because organic leaves always go down
  3. Because clay may accumulate
  4. Because parent rock disappears
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  1. It is made only of fresh leaves
  2. It is always complete humus
  3. It is an atmospheric layer
  4. It is closely linked with partly weathered parent material
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  1. When little time is available on a new deposit
  2. When a surface remains stable for long
  3. When climate and biological activity are suitable
  4. When protected on deep flat surface
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  1. Because parent material gives different minerals and particle sizes
  2. Because climate never works
  3. Because time is always zero
  4. Because organisms remain absent
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  1. One factor always eliminates all other factors
  2. Soil properties form through combined effects of many factors
  3. Parent rock has no contribution
  4. Time applies only to rivers
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  1. Porosity and humus decrease in soil
  2. Soil instantly becomes rock
  3. Humus nutrients and structure may improve
  4. River flow changes
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  1. Where formation rate exceeds erosion rate
  2. Where erosion rate exceeds formation rate
  3. Where surface is covered with grass
  4. Where flat land is stable
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  1. Increase in runoff and sheet erosion
  2. Formation of permanent ice
  3. Evaporation of river
  4. Birth of all minerals
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  1. Water only wets soil
  2. Water is a medium of weathering solution transport and leaching
  3. Water affects no chemical in soil
  4. Water works only in dry regions
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  1. Soil is only powder of parent rock
  2. Soil is only plant leaves
  3. Soil is a dynamic result of physical chemical biological and human processes
  4. Soil formation completes in one day
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  1. Surface accumulation of calcium carbonate
  2. Rock abrasion by glacier
  3. Evaporation of salts
  4. Binding and movement of metal ions by organic molecules

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