How can sediments be used to provide proxies to understand past environmental changes?

 Sediments are used to provide the proxies to understand the environmental changes as, the sediments are formed by the activity of the weathering from the wind, glacier and the water. The different weathering agent and other transportation agent are different types of the mark over the sediments that help in the study of the past environment.

answer; european crusades;

answer; ///i believe the correct answer to the above question is; ///(drainage basin;