Which of the following features is of volcanic origin?

Step 1: Analyze the question The question asks which feature is formed by volcanic activity, which means magma (molten rock) rising from within the Earth.

Step 2: Explain the concept Intrusive volcanic (igneous) features form when magma pushes into the crust and cools without reaching the surface. Examples are:

• Sill: a horizontal sheet of igneous rock that forces its way between bedding planes of existing rock layers.
• Dyke: a vertical or steeply inclined sheet that cuts across rock layers.
• Batholith, laccolith, lopolith: other intrusive bodies.

Step 3: Check each option

• A. Sill: Formed when magma squeezes between horizontal rock layers and solidifies. This is volcanic in origin. ✔
• B. Zeugen: Tabular masses of hard rock left standing after wind abrasion wears away the softer rock beneath. Formed by wind erosion in deserts.
• C. Loess: Fine, wind-blown silt deposited over wide areas. Formed by wind deposition.
• D. Gorge: A deep, narrow valley with steep sides. Formed by river erosion (vertical downcutting).

Step 4: Answer Only the sill is of volcanic (igneous) origin.

Tip: Group landforms by the agent that makes them:

• Volcanic/igneous: sill, dyke, batholith, laccolith
• Wind: zeugen, yardang, loess, dunes
• River: gorge, waterfall, meander

For a "volcanic origin" question, look for the intrusive features (sill, dyke) first.