User:OLEsem2/sandbox

= Calcium cycle = The calcium cycle allows the transformation of calcium between its soluble and insoluble forms, thus allowing the movement of calcium between living organisms and the earth. Calcium present within sedimentary rock can be released into both the soil and ocean by XXXX. Here it can be used by both marine and terrestrial plants. The plants XXXXX. These plants containing calcium are then consumed by marine and terrestrial animals where it is used to XXX, XXXX and XXXX. Lastly, death of the living organisms (both plants and animals) will finish the cycle as the calcium is leached back into the soil where it can be formed into rock, shells or absorbed once again by plants.

The continuous cycle is essential for the maintenance of life on earth. Without calcium, XXXX would not occur, thus impacting XXXXX. The cyclical nature ensures distribution of calcium to all  organisms that require it.

sub sections to include:

Calcium carbonate in sedimentary rock/shells of marine organisms

 * Calcium exists in sedimentary rocks, shells of marine organisms and in soil

Chemical weathering/rain releasing calcium into the water (runoff)

 * Chemical reactions involved


 * Effects of our changing environment

Human/animal use of this calcium

 * Biological viewpoint

Completion of the cycle – calcium from dead organisms leaching back into the ground

 * Calcium leeching from dead organism in the ground through the soil where it can be cycled back into plants and later eaten by animals where this smaller cycle may occur OR
 * Calcium cycling back into sedimentary rock (ie limestone) to reach the initial phase of the circuit

The importance of the calcium cycle

 * Summation of previous points, drawing the conclusion that the cycling of calcium is essential for all life forms, mention links to other cycles
 * Concluding statement