(a) Identify specimens D, E and F (3 marks) Specimen D; Specimen E; Specimen F; (b) Classify specimens D, E and F according to their mode of formation (3 ma...

(a) Identification of the specimens

• Specimen D: Pebbles (sandstone)
• Specimen E: Granite
• Specimen F: Marble

(b) Classification according to mode of formation

(c) Three characteristics each of specimens D and E

Specimen D (pebbles / sandstone):

• Occurs in layers or strata.
• Non-crystalline in nature and may be coarse, fine, soft or hard.
• May contain fossils (plant and animal remains) and is not resistant to erosion.

Specimen E (granite):

• Crystalline in nature, containing visible interlocking crystals.
• Very hard, massive and impermeable to water.
• Highly resistant to erosion and weathering, and contains no fossils.

(d) Three ways specimen E (granite) is economically important

• Used for road construction on farms and for building houses.
• Polished and used for decorations, and used as a grinding stone or for sharpening cutlasses and knives.
• Serves as a source of minerals, a source of foreign exchange and a source of employment.