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- Carbon dioxide emitted through anthropogenic means is changing the saturation of seawater and affecting calcium intake of animals like coral.
- Low levels of calcium due to humans can cause the eggs that birds lay to be more fragile due to the lack of calcium.
- When nitrate fertilizers are applied to soil, plants absorb calcium.
- Applying too much sodium, potassium, magnesium, or any positively charges ions can cause a decrease in calcium uptake in plants.
The calcium cycle allows for the transition of calcium between its soluble and insoluble forms, thus allowing the continual movement of calcium between living organisms and the earth. Calcium present within sedimentary rock, especially limestone, can be released into both the soil and ocean. They are not present in a gaseous phase, but all can be deposited in air through small amounts of dust. Because of their positive charges, calcium ions are attracted to the negative charges present on the surfaces of most soil particles.