When lava makes its way through cracks and fissures developed in the ground, it solidifies almost perpendicular to the ground. It cools down in the same position to develop a wall-like structure. What is this structure called?

Correct option is B

The structure described is called a Dyke.

Here's why:

• Dykes: These are sheet-like intrusions of igneous rock that cut across the layering of the surrounding rock. They form when magma intrudes into fractures in the rock and solidifies.
• Lacolith: These are dome-shaped intrusions that uplift the overlying rock layers.
• Lapolith: These are saucer-shaped intrusions that sag the overlying rock layers.
• Phacolith: These are lens-shaped intrusions that concordantly intrude along folds in the host rock.