Laterite, used as a building material, is extensively found in:

The correct answer is: a) Midlands.

Laterite is a type of soil that is rich in iron and aluminum oxides. It is formed in tropical and subtropical regions where there is a lot of rainfall and the soil is well-drained. Laterite is a very hard and durable material, and it is often used as a building material. It is also used in the manufacture of bricks, tiles, and other building products.

The other options are incorrect because:

• High Ranges: Laterite is not found in high ranges because the climate is not suitable for its formation.
• Coastal belts: Laterite is not found in coastal belts because the soil is too salty.
• River deltas: Laterite is not found in river deltas because the soil is too sandy.

Laterite is a valuable resource, and it is important to manage its use carefully. It is important to avoid over-exploitation of laterite, as this can lead to soil erosion and other environmental problems.