Crushed limestone can add nutrients and reduce ... In fact, flat boulders make good steps. These large landscape rocks are sometimes used to build retaining walls or tiered yards because their ...

Put simply, limestone is a type of rock that is formed by organisms ... have that would convince you to use them in your own ...

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 ...