Neco 2023 Geography Question 6

A geologist examines a rock sample collected from a riverbank. The observations are as follows: - The rock is coarse‑grained with interlocking crystals that are easily visible to the naked eye. - The dominant minerals are quartz, orthoclase feldspar and mica. - The texture is granular and the rock shows no layering. - The rock feels hard and has a conchoidal fracture. Answer the following questions. (a) Identify the rock type. (b) Explain the geological processes that led to the formation of this rock. (c) Discuss two major economic uses of this rock type. (d) Evaluate how chemical weathering would affect the durability of this rock if it were used as a building material in a humid tropical environment.