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•Calcium is in an organic state once it has been absorbed by plants
•Calcium can continually be recycled between plant roots and soil
•Herbivores can eat these plants that have absorbed the calcium, and then it will return to the Biosphere
•Calcium enters in the form of dust or from organisms
•Calcium does not have a gaseous state, so it does not stay in the atmosphere
•When animals die, the calcium in their bodies decomposes, and enters the soil
•Calcium is found in igneous rocks as calcium silicates
•Also found in sedimentary and metamorphic rocks as calcium carbonates
•Plants need calcium to help in cell wall development and their metabolism
•Stronger cells walls protect from pathogens
•Humans and animals need calcium to grow big and strong
•Humans use calcium most often as
a natural tool to increase soil fertility
•Calcium is also important for humans
when it comes to strengthening bones
•Chemical element symbol: Ca
•Soft gray alkaline earth metal
•Fifth most abundant element by mass in the Earth's crust
•Water can carry calcium to or from soil through weathering
•When in the soil, calcium is an insoluble form until it is broken down by microbes
•Mineralization can store calcium in rocks
•Calcium is absorbed by plants through their roots