Some states require the use of an engineer during the design process if the retaining wall exceeds a specific number of vertical feet. The overall height includes the portion that is buried in the dirt, known as the key, which is vital to ensure the lower portion of the wall doesn't collapse and cause soil sliding.
Magnesium is almost always found in compound form in nature, with the most abundant source being ocean water. Normally, magnesium is found as magnesite, which is magnesium carbonate, or dolomite. In seawater, magnesium is the third most abundant mineral behind both sodium and chloride. Continue Reading.
Confidence votes 176. Magnesium is part of the chlorophyll in all green plants and essential for photosynthesis. Magnesium is found in algal pigments (known as chlorophyll) and is used in the metabolism of plants, algae, fungi, and bacteria.Magnesium is found in many enzymes in both plants and animals.An enzyme is a catalyst in a living organism.agnesium is an essential element in the chlorophyll molecule-therefore plants need it to survive. Magnesium sulfate is commonly used to replenish the magnesium content in â¦ soil. 5 people found this useful.