When does soil become waterlogged? 

The composition of four soil samples collected from different regions are shown in figure.

i) Which soil had the most amount of humus?

ii) Which soil had the least amount of gravel?

iii) Does sample A contain more clay than sample B?

iv) Sample B had the lowest number of earthworms. Try to explain why.

v) Which of the soils is suitable for growing rice?

vi) Which of the soils is suitable for growing wheat?