geoexplorer on Instagram: "Spheroidal weathering is a type of chemical weathering that occurs in massive rocks, creating spherical or concentric layers of weathered rock around a core of unweathered rock. It's also known as onion skin weathering, concentric weathering, spherical weathering, or woolsack weathering. Spheroidal weathering is caused by a combination of factors, including: Constant wetting and drying, Evaporation, Pressure from precipitation and salt crystals, and Chemical precipitat