Explanation:
(a)
There is inverse relation between concentration of aluminium and pH value and it can lead to aluminium toxicity. In this case it will dominate in the form of Hydroxy- aluminium, Al³⁺ cation and polynuclear species.
(b)
Various minerals are brought to the soil during its formation . As we know the pedogenesis process starts due to erosion of the rocks and rocks contain various minerals, of which aluminium is also a part. With time, aluminium gets dissolved in water and the soil and as the rocks become soil after going through various processes like traction, solution etc, it gets aluminium ions also with it.
Sinkholes can for when:
A. <span>Rainwater containing carbon dioxide dissolves underground rock
</span>Water in an underground rock<span> or sediment layer is groundwater. </span>Underground<span> water </span>can<span> also erode and deposit material. </span>Rainwater<span> absorbs </span>carbon dioxide<span> (</span><span>CO2) as it falls. The CO2 groundwater creates landforms by </span>dissolving<span> away </span><span>rock.</span>
B. The water is surrounded by stable rock, soil. If this is incorrect please comment saying Sorry this is incorrect and explain why and how.
The Sikhs are the ethnic groups who wanted a separate state of their own. The Sikhs are a follower of Sikhism. It is a monotheist religion in the Punjab region of India. During 1940s, the Sikhs worried that their community would be left without a homeland thus they push through the idea of Khalistan, seeing it as a small state that is a part of Punjab region.
Answer: I think the answer is D