Deep-sea sediment cores can provide a climate chronology going back as far as years.

Sea sediments refers to any dump or material put into ocean which is insoluble, normally that is rocks or particles of soil which are transferred from the earth surface to the sea via winds, storms or other mediums which may include oceanic materials that makes layer upon layers.

always include the steps and/or background required to get to the final answer. let’s other people understand and solve future problems on their own.

i think you really need to revive you answer! : d