(a) (i) Classify specimens B and D according to their mode of formation.
(ii) Name two other rocks for each mode of formation.
(b) Given three differences between specimens B and D.
(c) State three uses of specimen D in agriculture.
(d) State five disadvantages of an abundance of specimen D on a farmland.
Explanation
(a)(i) Classification of specimens B and D according to their mode of formation are as follows:
- B - Sedimentary rock
- D - Igneous rock
(ii) Other examples of each rock types are:
- B - Limestone, shale, coal, common salt, gypsum, breccia, conglomerate.
- D - Basalt, gabro, diorite, pumice
(b) Differences:
- B has layers/ stata while D does not have layers.
- Particles are loosely held together in specimen B but not so in specimen D.
- Particles in specimen B are fine while those in D are coarse.
- Specimen B is lighter than specimen D.
- B is prone to erosion while D is resistant to.
- B is fairly soft while D is hard.
- D is crystaline while B is not.
- B is fossilized while D is not.
(c) Uses of specimen D in agriculture are:
- In control of erosion.
- Building farm structures.
- For decorations (external and interior).
- Farm road construction.
- Grinding/sharpening farm tools.
(d) Disadvantages of abundance of specimen D on a farmland;
- Increase coast of tillage operations.
- Predisposes man and animals to injury.
- Reduces amount of arable land.
- Implements wear out fast.
- Increases drudgery.
- Hideout for reptiles and rodents.
- Prevents root penetration.
- Makes tillage operations difficult.
- Disturbs the growth of plants.
- Tends to increase ambient temperature during hot season.
- Hinders the activities of micro and macro-organisms.