Respuesta :
The age of the oldest sediments recovered by deep-ocean drilling is 180 million years old in the ocean 4 billion years old on the continent.
What are sediments?
- Sediment is a naturally occurring substance that is broken down by weathering and erosion processes and then moved by the force of gravity acting on the particles or by the action of wind, water, or ice.
- For instance, sand and silt may be conveyed in river water in suspension and deposited on the sea floor by sedimentation; if buried, they may eventually undergo lithification to create sandstone and siltstone, respectively.
- Although wind, glaciers, and water are the most common means of movement for sediments.
Deposition are exemplified by beach sands and river channel deposits, but sediment also frequently settles out of still or slowly flowing water in lakes and seas. Aeolian transport and deposition are demonstrated by desert sand dunes.
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