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.
The rate of pacific plate motion is 7 centimeters per year.
<h3>Movement of pacific plate</h3>
The rate of pacific plate motion is seven centimeters which is equals to 2.75 inches per year i.e. about the rate at which fingernails grow. The main reason behind the movement of Pacific Plate is due to sea floor spreading from the East Pacific Rise (divergent margin) in the Gulf of California.
While on the other hand, the North American Plate moved to the west and north west due to sea floor spreading from the Mid Atlantic Ridge (divergent margin) so we can conclude that the rate of pacific plate motion is 7 centimeters per year.
Learn more about plate movement here: brainly.com/question/18219355
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Most lakes were formed from Melting glaciers. Because when the glaciers melted they became lakes.
Hope this helps.
I guess the answer to the blank will be:
During the second Red Scare public and government suspicious of Communism led to the blacklisting of people in various industries.
Organization of Petrochemical Exporting Countries
