The three types of rocks igneous, sedimentary, and metamorphic are all subject to processes that change one rock type into another. The images below show several types of rocks undergoing these processes.
Lime is a soil amendment made by grinding limestone, a naturally occurring type of rock that is very high in calcium. Two types of lime are commonly used in lawns and gardens, agricultural lime and dolomitic lime. Agricultural lime, also sold as garden lime, is made from calcium carbonate.
If your pH level is lower than 5.5, the addition of an agricultural liming material (Aglime) should be of benefit. Lime acts to neutralize soil acidity and supply nutrients such as calcium and magnesium to the soil. If needed, the addition of lime can help avoid blossom end rot in tomatoes. It is generally suggested that it be spread evenly throughout the garden two to three months before planting.