ESSAY [80 marks] Answer four questions only from this section. Credit will be given for clarity of expression and orderly presentation All questions carry equal marks. (a) in (0) List three major types of weathering. (ii) Explain the role of temperature in weathering of rocks. changes es in temperature bring about crocks m rocks A 100 W heater is connected to a 240 V mains supply. Calculate the: 0 current drawn; (ii) resistance of the heater. b) Lyon (1) List three compounds which have electrovalent bond. Voden Give two characteristics of electrovalent compounds. They have high melting point lake​