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:
“While the Republic has already acquired a history world-wide, America is still unsettled and unexplored. Like the English in New Holland, we live only on the shores of a continent even yet, and hardly know where the rivers come from which float our navy.”
—Henry David Thoreau (1817–1862)
“What is more hopelessly uninteresting than accomplished liberty? Great swarming, teeming Sydney flowing out into these myriads of bungalows, like shallow waters spreading, undyked. And what then? Nothing. No inner life, no high command, no interest in anything finally.”
—D.H. (David Herbert)
“Thy seas in delicate haze
Go off; those mooned sands forsake their place;
And where they are, shall other seas in turn
Mow with their scythes of whiteness other bays.”
—Lucretius (Titus Lucretius Carus)