(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 marks)
(c) State three characteristics of each of specimens D and E (6 marks)
(d) State three ways in which specimen E is economically important.
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