Soil Classification MCQ with answer and solution

Concept

Classification of gravity transported soil

Formula

NONE

Step-by-step solution

1. Soil materials transported down slopes primarily under the action of gravity are termed colluvial deposits. 2. Talus is a specific term for loose rock debris and soil accumulated at the base of steep slopes by gravitational forces. 3. Lacustrine soils are deposited in lakes, while alluvial soils are deposited by running water. Answer: A

Explanation

Talus soil is soil or rock debris that moves down mountain slopes and accumulates at the base primarily under the influence of gravitational force. In contrast, alluvial soils are transported by running water and lacustrine soils are deposited in lakes.

Why the other options are wrong

B) Lacustrine soils are formed by deposition in lake waters. C) Alluvial soils are transported and deposited by running water. D) Muck consists of highly decomposed organic matter mixed with inorganic soil.

Shortcut

Gravity-transported soil = Talus (Colluvial soil).

Common mistake

Confusing gravity-transported soil like talus with water-deposited soils like alluvial or lacustrine.