Marine sediment refers to the particles that settle at the bottom of oceans and seas. These sediments can be composed of various materials, including sand, silt, clay, and organic matter. They originate from land erosion, volcanic activity, and the remains of marine organisms. Over time, these sediments accumulate and can form layers that provide valuable information about Earth's history. The study of marine sediment is important for understanding oceanography, paleoclimatology, and geology. By analyzing sediment cores, scientists can learn about past climate conditions, ocean currents, and even the evolution of life in the oceans. This research helps us understand how marine environments change over time.