in an experiment to compare thermal conductivity of materials such as iron, lead, aluminium, copper and wood. the arrows on the rocks indicate the extent at which the vaseline applied around the material melted when heat is applied. i. identify each of the materials labeled I, II, III, IV and V using the melting level of the vaselineii. which material had the least melting of the vaseline?iii. give one reason for your answer in (ii) aboveiv. arrange the materials in order of decreasing conductivity of heatv. mention two modes of heat transfer in this experiment