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Formation and Types of Soils

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Questions and Answers

What are soils formed from?

Metals and minerals

Plants and animals

Volcanic eruptions

Physical and chemical weathering of rocks (correct)

Which type of soil contains calcium carbonate and effervesces when treated with hydrochloric acid?

Calcareous soil (correct)

Marine soils

Aeolian soils

Colluvial soils

What are Aeolian soils?

Soils transported by wind (correct)

Soils formed by deposition in the seas

Soils formed by movement of soil by gravity

Soils transported by running water

What are the main components of minerals of interest to geotechnical engineers?

Oxygen and silicon Signup and view all the answers

Which group do kaolinite, illite, and montmorillonite belong to?

Clay minerals Signup and view all the answers

Where are alluvial soils deposited?

Along streams by running water Signup and view all the answers

What holds the layers together in Montmorillonite?

Van der Waals forces Signup and view all the answers

What are the spaces between mineral particles in soil called?

Voids Signup and view all the answers

Which process is used to determine particle sizes for gravels and sands?

Sieving Signup and view all the answers

Why is hydrometer analysis used for determining particle sizes of fine-grained soils (silts and clays)?

Their extremely small size makes sieving impractical Signup and view all the answers

According to the USCS and ASTM specifications, what is the particle size range for sand?

< 4.75 mm and ≥ 0.075 mm Signup and view all the answers

What is a potential issue with hydrometer analysis for clay particles?

Collision of plate-like clay particles during sedimentation Signup and view all the answers