Metamorphic grade refers to the intensity of temperature and pressure conditions under which a metamorphic rock forms. It helps classify the degree of metamorphism that a rock has undergone, ranging from low-grade to high-grade metamorphism. Low-grade metamorphic rocks, like slate, form under relatively low temperatures and pressures, while high-grade rocks, such as gneiss, develop under much higher conditions. The concept of metamorphic grade is essential in geology as it provides insights into the geological history and processes that shaped a region. By studying the mineral composition and texture of metamorphic rocks, geologists can infer the conditions of formation and the tectonic environment, contributing to our understanding of Earth's dynamic systems.