1. Demi Sabados & Alec Ayala Marshall

2. Calcium Steps Step 1: Weathering away of rocks that contain calcium carbonates/ silicates Step 2: Calcium flows into the ocean, and stays there for one million years Step 3: Eventually returns to the land due to precipitation

3. Human Dependencies Humans often use calcium as a natural tool to increase soil fertility. Calcium is also vital for humans when it comes to strengthening their bones. i.e. (Milk) Calcium is a mineral necessary for life

4. Human Affects Industrial emissions and land use have changed chemical weathering rates and leached calcium ions out of soils, aggravating plant and microbial community structures. The increased acidity of the ocean waters associated with raising atmospheric concentrations of CO2 has decreased the saturation state of surface water with respect to calcite minerals, causing difficulty for calcitic organisms to produce shells and skeletons. PollutionOverfishing

5. Fun Facts & Study Tool Calcium is the 5 th most abundant element in Earth’s crust, present at a level of about 3% in the oceans and soil. The element name “calcium” comes from the Latin word “calcis” meaning “lime” C-CrucialC-CalcisM-Mineral A-AbundantI-Industrial emmisions L-LifeU-Use

6. Magnesium Cycle Found in high concentrations in limestone and marble As rock particles weather over time, magnesium particles are slowly released into the soil Plants take in nutrients from soil, including magnesium When plants decompose magnesium particles are released into the atmosphere (not in a gas state)

7. Marble soil Plant Atmosphere Human and animal use

8. RSPDA RockSoilPlantDecompositionAir

9. Magnesium and human impact and dependence We, as well as plants and animals need magnesium to function. Humans impact mg cycle through pollution Example: Acid Rain depletes amount of mg in soil Soil now cannot produce healthy plants Causes magnesium deficiencies

10. Fun facts Magnesium is the central element of chlorophyll Scientists can tell if a plant has a magnesium deficiency by plants color Mg is the basis of early life on earth Alcohol abuse can lead to mg deficiency

11. Sources https://prezi.com/ndl3mx0vtxtj/the-calcium-cycle/ http://chemistry.about.com/od/elementfacts/a/10-calcium- facts.htm http://chemistry.about.com/od/elementfacts/a/10-calcium- facts.htm http://www.exatest.com/minerals.htm https://prezi.com/6ped_sheurn_/magnesium-cycle/ http://www.webmd.com/vitamins- supplements/ingredientmono-998- magnesium.aspx?activeingredientid=998&activeingredien tname=magnesium http://www.webmd.com/vitamins- supplements/ingredientmono-998- magnesium.aspx?activeingredientid=998&activeingredien tname=magnesium http://www.ancient-minerals.com/magnesium- benefits/what-is-function/ http://www.ancient-minerals.com/magnesium- benefits/what-is-function/