Which of the following features is of volcanic origin?

Step 1: Analyze the question We need the feature that forms from volcanic (igneous) activity, meaning it is made when magma cools and solidifies.

Step 2: Explain the concept Volcanic or igneous features are formed when magma rises through or between rock layers and then cools. These are divided into:

• Intrusive features (magma cools underground): sill, dyke, batholith, laccolith, lopolith
• Extrusive features (magma reaches the surface): volcanic cones, lava plateaus, craters, calderas

Step 3: Check each option

• A. Sill: A horizontal sheet of igneous rock formed when magma squeezes between layers of sedimentary rock and cools. This is volcanic (igneous) in origin.
• B. Zeugen: Table-like rock ridges with a hard cap rock, formed by wind erosion in deserts. Not volcanic.
• C. Loess: Fine, wind-blown silt deposited by wind. Not volcanic.
• D. Gorge: A deep, narrow valley cut by river erosion. Not volcanic.

Step 4: Answer The correct answer is A. Sill. It is the only feature formed by magma intruding and cooling.

Tip: Remember "Sill = Sheet, horizontal; Dyke = Divides, vertical." Also remember that Zeugen and Loess go with wind action, while Gorge goes with rivers. When a question asks about volcanic features, look for words like sill, dyke, batholith, laccolith, or crater.