In order for a substance to be classed as a mineral it must be naturally occurring, solid and inorganic. Additionally, it must have a clearly defined structure and chemical composition.
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<span> A decrease in lung volume decreases the pressure within the lungs so air can flow inside. </span>
A positively charged ion is called cation.
A negatively charged ion is called anion.
A salt is formed by the ionic bonding of a cation and an anion.
pH is a measure of the hydrogen ion concentration in a solution.
