4.3 The schematic representation below shows cations in soil solution and soi! colloid. Na H Mo H H A to the colloid K Colloid H to soil solution H H* K B 4.3.1 Indicate the terms that applies to the process occurring in part A and B. 4.3.2 Provide a reason for the process in QUESTION 4.3.1 B. (2) (1) 4.3.3 Differentiate between sodic and saline soils with regard to the dominant salts. (2) 4.4 The table below gives soil temperature readings at two different depths (soil surface and at 20 cm) taken from 06:00 until 18:00 in the evening: Depth (cm) 15 Clayey soil 30 ˚C Sandy soil 26 °C 30 28 °C 27 C 45 28.9 °C 27.9 °C 60 75 27 C 26.5 'C 29 ˚C 30 ˚C 4.4.1 Use the data in the table above and draw a line graph show temperature of clay soil and sandy soil at different depths. (6)​