CONNOR: Good thinking! I read a bit about limestone on the bus journey. Limestone is a sedimentary rock created by layers of skeletons and shells of sea creatures found in ancient, warm ...

Lime intended for garden use is labeled as "garden lime" or "dolomitic lime." Made from ground-up rock, limestone, or dolomite, lime is high in calcium. Dolomitic lime differs from garden lime in ...

Limestone, made from calcium carbonate, takes millions of years to form. These sedimentary rocks are born from the decay and fossilization of marine organisms — think coral and clams.