Ejecta refers to the material that is thrown out or expelled from a central source, such as a volcano, impact crater, or explosion. This material can include rocks, debris, and gases that are propelled into the surrounding environment. Ejecta studies typically focus on analyzing the composition, distribution, and characteristics of these materials to understand the processes that led to their expulsion and the potential impacts on the surrounding area. Research in this area can provide insights into volcanic eruptions, meteorite impacts, and other geological events.