Rock strata are layers of rock that have formed over time through various geological processes. These layers can vary in thickness, composition, and color, often reflecting changes in the environment where they were deposited. Strata can be found in sedimentary rocks, which are created from the accumulation of sediments like sand, silt, and clay. Studying rock strata helps geologists understand Earth's history, including past climates and the evolution of life. The arrangement of these layers can reveal important information about events such as volcanic eruptions, earthquakes, and the movement of tectonic plates.