Shores and Shallow Seas
Seas, oceans and lakes accumulate sediment over time. The sediment could consist of terrigenous material, which originates on land, but may be deposited in either terrestrial, marine, or lacustrine (lake) environments; or of sediments (often biological) originating in the body of water. Terrigenous material is often supplied by nearby rivers and streams or reworked marine sediment (e.g. sand). In the mid-ocean, living organisms are primarily responsible for the sediment accumulation, their shells sinking to the ocean floor upon death.
Deposited sediments are the source of sedimentary rocks, which can contain fossils of the inhabitants of the body of water that were, upon death, covered by accumulating sediment. Lake bed sediments that have not solidified into rock can be used to determine past climatic conditions.
Read more about this topic: Sediment
Famous quotes containing the words shores, shallow and/or seas:
“We have found a strange footprint on the shores of the unknown. We have devised profound theories, one after another, to account for its origin. At last we have succeeded in reconstructing the creature that made the footprint. And lo! It is our own.”
—Arthur S. Eddington (1882–1944)
“On shallow slates the pigeons shift together,
Backing against a thin rain from the west....”
—Philip Larkin (1922–1986)
“In some unused lagoon, some nameless bay,
On sluggish, lonesome waters, anchor’d near the shore,
An old, dismasted, gray and batter’d ship, disabled, done,
After free voyages to all the seas of earth, haul’d up at last and
hawser’d tight,
Lies rusting, mouldering.”
—Walt Whitman (1819–1892)