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.
When to Lime your lawn: Fall marks the calendar time when you transition from maintaining your lawn to preparing for the next grass growing season. One consideration in this season is the health of the soil your grass grows in. Lawns grow best when the soil has a neutral pH level, not testing either acidic or alkaline.