Like pea gravel, these garden rocks are often used for drainage ... Made of durable natural stones such as granite, limestone, or basalt, cobblestone is sold in small blocks.

The Environment Agency says the new pass will help the flow of brown trout, eels and coarse fish.

For example, marble is created when limestone is pressure-cooked within the earth, causing the minerals that compose the stone to re-form into new crystals. Sedimentary rock is formed by the ...