Explanation

(a) ldentification of specimens D, E, and F

• Specimens D; Pebbles or sanstone
• Specimen E ; Granite
• Specimen F: Marble

(b) Classification of specimens D, E and F acorrding to the mode of formation

D- Sedimentary rock

E- lgneous rock

F-Metamorphic rock

(c) Characteristics of specimens D and E

Specimen D (Pebbles/ Sandstone)

• Occurs in layers or strata
• May be coarse, fine, soft or hard
• Non-crystalline in nature
• May contain fossils/plant and animal remains
• Not resistant to erosion
• May be porous

Specimen E (Granite)

• Crystalline in nature/contain crystals 
• Very hard
• It is massive
• Impermeable to water
• Highly resistant to erosion and weather element
• Does not contain fossils

(d) Ways in which specimen E (Granite) is economically important

• Sources of minerals
• Used as grinding stone
• For sharpening of cutlasses and knives
• As bunds to prevent erosion
• To crack hard kernels/seeds
• For road construction in farms
• For building houses
• Can be polished and used for decorations
• Source of foreign exchange
• Source of job opportunity

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