sediment

They dove thirty feet and then removed another three feet of sediment before uncovering one of the Hunley’s two small conning towers.

For many years, scientists have known that fine particles from space steadily fall to Earth and accumulate in ocean sediments.

Imprinted in sediments or sedimentary rock, they record a specific moment of activity and confirm the exact location where an individual stood or moved.

For years, geologists assumed these enriched elements came from ocean sediments pulled into the mantle when tectonic plates sink, or from columns of rising hot rock known as mantle plumes.

Sulfur and iron are particularly essential for microbial communities that live in oxygen-deprived habitats such as ocean floors, wetlands, and sediments.