Scoria is a type of volcanic rock that is formed when lava cools quickly and traps gas bubbles. This process gives scoria its characteristic lightweight and porous texture. It is typically dark in color, ranging from black to reddish-brown, and is often found near volcanic areas. Due to its unique properties, scoria is commonly used in landscaping, drainage systems, and as a lightweight aggregate in construction. Its ability to retain moisture makes it beneficial for gardening, while its porous nature allows for good drainage in various applications.