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Sediments accumulate in the Atlantic at approximately 1 cm kyr-1 How thick are the sediments approximately 500 km from the ridge crest when the spreading rate is 2.5cm yr-1?
Wiki User
∙ 14y ago
500 km = 50 x 106 cm.
50 x 106 cm / 2.5 cmyr-1 = 20 x 106 years or twenty million years.
If it takes 1000 years to form 1 cm of sediment, then the thickness of the sediment in cm is:
20x106 / 1x103
Thickness of sediment = 20,000 cm or 200m.
Wiki User
∙ 14y ago
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Is the analysis of seafoor sediments evidence of sea-floor spreading?
Not really but sea floor sediments thickness increase with increased distance from spreading centers which is good evidence. Other evidence such as magnetic reversals, temperature, dating methods provide the best evidence of seafloor spreading
How does the age of seafloor sediments change with increasing distance from the ocean range?
At ocean spreading ridges, new oceanic crust is formed. The magma that forms this new crust emerges from the ridge and pushes the pre-existing rocks away from the ridge laterally. This results in a strip of new rock cutting through the older rock. As formation of the crust continues, the older rocks will be pushed further away from the ridge, while younger, newly produced rocks will occupy the area closest to the ridge.
What features caused by seafloor spreading?
There is a mid ocean ridge that forms because the hot magma is lighter (less dense than the colder magma. The ridge is located at the spreading center. There are magnetic anomalies that can be thought of as stripes that mirror each other on either side of the spreading center. There are remnants of the pipes that form from upwelling hot springs (black smokers). There are pillow basalts that form from sudden cooling as it encounters sea water. It is generally rugged and rocky near the spreading center but tends to be more covered with sediments as you move away from it.
Typical rates of sea-floor spreading are approximately .?
5 centimeters per year
Where on the ocean floor would you find old rocks?
The oldest oceanic crust is generally found at the largest distance from the spreading centre where it was generated. the best place to go at the moment would be the pacific ocean south east of Japan, where there is Jurassic ocean crust preserved. Oceanic crust of the same age can be found East of the United States of America and west of Africa as well but there one finds much less because of slower spreading rates. These rocks are usually buried by hundreds of meters of sediments and are thus mostly not directly accessible. Very old rocks can be found on the ocean floor, when icebergs carry gravel and stones derived from old continental crust (like large parts of Skandinavia) onto the ocean and drop them as they melt (drop stones).
Is the analysis of seafoor sediments evidence of sea-floor spreading?
Not really but sea floor sediments thickness increase with increased distance from spreading centers which is good evidence. Other evidence such as magnetic reversals, temperature, dating methods provide the best evidence of seafloor spreading
How does the age of seafloor sediments change with increasing distance from the ocean range?
At ocean spreading ridges, new oceanic crust is formed. The magma that forms this new crust emerges from the ridge and pushes the pre-existing rocks away from the ridge laterally. This results in a strip of new rock cutting through the older rock. As formation of the crust continues, the older rocks will be pushed further away from the ridge, while younger, newly produced rocks will occupy the area closest to the ridge.
How do abyssal plains form?
Abyssal plains form beneath the deep ocean, usually found between 3,000 and 6,000 meters deep. Sediments accumulate slowly over time, mostly from fine-grained particles settling from the water column. These sediments are typically made up of organic materials and eroded materials from the continents. The gradual deposition of these sediments over millions of years creates a flat, featureless seabed known as an abyssal plain.
How are ocean-floor rocks and sediments evidence of seafloor spreading?
because that there are younger rocks found at ocean ridges than the ones found near deep-sea trenches
Explain how ocean-floor rocks and sediments are evidence of seafloor spreading?
The seafloor rocks vary in different places. Rock samples near ocean ridges are younger than rocks at deep sea trenches
What process occurs when a river's water slows down and sediments are dropped?
Yes, when a river, or any flow of water that enters the ocean slows down, and dumps out into the ocean, it deposits some sediments, it really just depends on how large is the flowing water source. _________________________ Not only does the water slow down, it also spreads out into a fan shape, which is called the "delta", because it resembles the triangular shape of the Greek letter delta. It is this "slowing down and spreading out" that allows the river to start depositing its silt; when the water is moving fast, it keeps churning all that dirt downstream.
What is andesitic compstion?
As the Pacific Plate is shoved and crunched under the South American Plate by sea floor spreading, the water-rich sediments of the sea floor are driven deep into the mantle. The metamorphosis from intense heat and pressure results in a class of rocks called andesites as described in previous remarks.
Explain how drilling samples provided evidence for sea floor spreading?
Scientists discovered that the rocks that were found farther away from the ridge the sample was taken from, the older the rocks were. The most recent rocks were always in the center of the ridges. This showed that sea-floor spreading really has taken place.
What features caused by seafloor spreading?
There is a mid ocean ridge that forms because the hot magma is lighter (less dense than the colder magma. The ridge is located at the spreading center. There are magnetic anomalies that can be thought of as stripes that mirror each other on either side of the spreading center. There are remnants of the pipes that form from upwelling hot springs (black smokers). There are pillow basalts that form from sudden cooling as it encounters sea water. It is generally rugged and rocky near the spreading center but tends to be more covered with sediments as you move away from it.
When did the apostles start spreading Jesus' teachings?
The Apostles began spreading the Gospel soon after Jesus' ascension in approximately 33AD.
Typical rates of sea-floor spreading are approximately .?
5 centimeters per year
What role does water play in erosion?
have you ever had a straw with ice in your drink at a restaurant and had the ice cube pinned between your straw and your glass? that is an example of erosion. if water continuously beats down on one place it may make a divet over time. this changes the shape of the object that is being beat down on
