In the Indian Soil classification system, coarse-grained soils comprise:

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  1. cobble, silt, clay and sand
  2. silt, cobble, sand and gravel
  3. boulder, cobble, gravel and sand
  4. Boulder, cobble, gravel and silt

Answer (Detailed Solution Below)

Option 3 : boulder, cobble, gravel and sand
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Explanation:

In the Indian Soil classification system, coarse-grained soils are categorized based on their particle size. These soils consist of larger particles and are typically more granular in nature.

The classification includes:

Boulder: These are the largest particles in the classification system, with a diameter greater than 300 mm.

Cobble: Cobble-sized particles have a diameter between 80 mm and 300 mm.

Gravel: Gravel consists of particles with a diameter between 4.75 mm and 80 mm.

Sand: Sand particles have a diameter between 0.075 mm and 4.75 mm.

Silt and clay are considered fine-grained soils and are not included in the coarse-grained soil classification. 

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