2. Composition: Sedimentary rocks are composed of various materials, including sand, silt, clay, and organic matter, which are derived from the weathering and erosion of pre-existing rocks.
3. Grain size: The grain size of sedimentary rocks depends on the size of the original sediments. Sandstone is composed of sand-sized particles, siltstone is composed of silt-sized particles, and claystone is composed of clay-sized particles.
4. Colour: The colour of sedimentary rocks depends on the minerals present in the sediments. For example, red sedimentary rocks contain iron oxide minerals, while green sedimentary rocks contain chlorite minerals.
5. Fossils: Many sedimentary rocks contain fossils, which are the preserved remains or traces of ancient organisms. Fossils can provide valuable information about the environment in which the sedimentary rock was formed, as well as the geological history of the area.
