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.

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