Form two student put some soil sample in a measuring cylinder, added some water and sodium carbonate and then covered the cylinder with the hand and shook the cylinder for about two minutes. He left the cylinder on the bench for one hour. The result was as shown below.

(i). Name the layers marked a,b,c, and d.                                           (2marks)
a ……………………………………………………………………………………………………
b ……………………………………………………………………………………………………
c …………………………………………………………………………………………………….
d………………………………………………………………………………………………….
(ii) What was the function of sodium carbonate in this experiment?                                        (1mark)
………………………………………………………………………………………………………………………………………………………………………………………………………………
(iii). What was the aim of this experiment ?                                              (1mark)
……………………………………………………………………………………………………

i) Naming of layers.
     A- Floating organic matter. (humus)
     B-Water with fine clay materials and dissolved mineral salts.
     C- Silt and clay.
     D- Gravel.
ii) Function of sodium carbonate.
Aid in dispensation of the particles.                                                                                 (1mark)
iii) Aim of this experiment.
To show that soil is made up of different sized particles.