What is the very best description for why there is no oceanic crust older than 180 million years of ages yet we have discovered continental crust that is 4.2 billion years of ages?
What is the very best description for why there is no oceanic crust older than 180 million years of ages yet we have discovered continental crust that is 4.2 billion years of ages? Oceanic crust is continuously being recycled at seafloor trenches so the earliest oceanic crusts has actually long because been damaged.
Why are the continents about 20 times older than the earliest ocean basins?
The continents are 20 times older than the earliest ocean basin due to the fact that the continents are not as thick as the oceanic plates so they do not subduct when a continental plate and an oceanic plate clash … In this manner they had the ability to do a shape throughout the atlantic ocean or any ocean for that matter.
Why was the discovery of no rocks older than 2 billion years of ages on the ocean flooring so crucial?
The discovery of no rocks older than 2 billion years of ages on the ocean flooring was essential due to the fact that this proof showed that brand-new seafloor functions are continuously being included due to seafloor dispersing Continental drift takes place due to the fact that of seafloor dispersing.
What is the resemblances of continental and oceanic crust?
Oceanic and Continental crusts are alike due to the fact that they both shift and relocation and grow They vary by there rock types. Oceanic crust is comprised of thick basalt while continental crust is comprised of less thick granite.
Why are continents a lot older than the ocean basins?
In reality the factor the continents are a lot older than the ocean flooring is that the continental crust is made up of product too light to sink into the mantle The subduction of oceanic lithosphere discusses the areas of deep earthquakes and lots of volcanoes.
Why is oceanic crust more youthful than continental crust quizlet?
Why is the oceanic crust more youthful than continental crust? It is due to the procedure of subduction oceanic crust tends to get cooler and denser with age as it spreads out off the mid-ocean ridges. As the continental crust is lighter than the oceanic crust the continental crust can not subduct.
How old are the earliest continental rocks quizlet?
How old are the earliest continental rocks? around 2.5 to 3.5 billion years of ages
How old are the earliest rocks on the ocean flooring quizlet?
The earliest rock in the ocean flooring is about 200 million years of ages On the other hand the earliest rock in the continents has to do with 4 billion years of ages.
How old is the Mid Atlantic Ridge?
The MAR started to form 200 million years back when the future American African and European continents still formed the Pangea.
How old is the Mid Ocean Ridge?
What are seafloor ages?
Seafloor age is an excellent method to see how plate tectonics works. Age increases in the instructions of spreading out plates so you see the youngest rock near the dispersing centers (like the mid-Atlantic). As more youthful seafloor forms it presses older crust ever further away.
Where were the continents 65 million years back?
What was the Earth like a million years back?
The Earth was formed about 4.6 billion years ago that’s 4 600 000 000 years back. It was formed by accidents of particles in a big cloud of product.
Earth’s Tectonic History.