Discuss two defects of sedimentation theory to prove the age of the earth
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Sedimentation is the tendency for particles in suspension to settle out of the fluid in which they are entrained and come to rest against a barrier. This is due to their motion through the fluid in response to the forces acting on them: these forces can be due to gravity, centrifugal acceleration, or electromagnetism.
In geology, sedimentation is often described as the opposite of erosion, i.e., the terminal end of sediment transport. In that sense, it includes the termination of transport by saltation or true bedload transport. Settling is the falling of suspended particles through the liquid, whereas sedimentation is the termination of the settling process. In estuarine environments, settling can be influenced by the presence or absence of vegetation. Trees such as mangroves are crucial to the attenuation of waves or currents, promoting the settlement of suspended particles.[1]
Sedimentation may pertain to objects of various sizes, ranging from large rocks in flowing water, to suspensions of dust and pollen particles, to cellular suspensions, to solutions of single molecules such as proteins and peptides. Even small molecules supply a sufficiently strong force to produce significant sedimentation.As such, rocks from early lunar history still sit on the surface of the moon. Samples returned from the Apollo and Luna missions revealed ages between 4.4 billion and 4.5 billion years, helping to constrain the age of Earth. ... A 4.4 billion year old zircon crystal from Australia is the oldest piece of Earth yet found.
The best estimate for Earth's age is based on radiometric dating of fragments from the Canyon Diablo iron meteorite. From the fragments, scientists calculated the relative abundances of elements that formed as radioactive uranium decayed over billions of years.
Sedimentation
This article is about the scientific phenomenon of sedimentation. For sedimentation in the treatment of water and wastewater see sedimentation ( water treatment ) .
sedimentation is the tendency for particles in suspension to settle out of the fluid in which they are entrained and come to rest against a barrier . This is due to their motion through the in forces acting on them : these forces can be gravity, centrifugal acceleration , or electromagnetism .
In geology , sedimentation is often described as the opposite of erosion , example , the terminal end of sediment transport . In that sense , it includes the termination of transport by saltation or true bed load transport. settling is the falling of suspended particles through the liquid , whereas sedimentation is the termination of the settling process . In esturarine environments , settling is the falling of suspended particles through the liquid , whereas sedimentation is the termination of the settling process In esturarine environments , settling can be influenced by the presence or absence of vegetation . tress such as mangroves are crucial to the attenuation , of waves or currents , promoting the settlement of suspended of particles
Sedimentation may pertain to object of various sizes , ranging from large rock in flowing water, to suspension of dust and pollen particles , to cellular suspension , to solution of single molecules such as proteins and peptides . Even small molecules supply a sufficiently strong force to produce significant sedimentation
The term is typically used in geology to describe the despotion of sediment which results in the formation of sedimentary rock , but it also used in various chemical and environmental fields to describe the motion of often smaller particles and molecules . This process is also used in the biotech industry to separate cells from the cultural media .
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