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Ocean acidification is the ongoing decrease in the pH of the Earth 's oceans, caused by the uptake of carbon dioxide (CO 2) from the atmosphere.
Other substances, such as hydroxide ions, raise the pH of a solution. Those are called bases. .....There are many different acids and bases that affect pH, but for clarity sake it will be easiest to think only in terms of hydrogen ions (H+) and hydroxide ions (OH-). When water has more free hydrogen ions floating around than hydroxide ions, it is acidic (pH less than 7).