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200 million.
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WHAT is the the composition of earth's crust?
Many different minerals are found in oceanic crust. Feldspar, basalt, pyroxene, and other molten rock materials make up the composition of the ocean's crust.
What is the best description of the composition of the earth and crust?
Many different minerals are found in oceanic crust. Feldspar, basalt, pyroxene, and other molten rock materials make up the composition of the ocean's crust.
What is the composition of earths oceans?
Many different minerals are found in oceanic crust. Feldspar, basalt, pyroxene, and other molten rock materials make up the composition of the ocean's crust.
Rocks in ocean crust are as old as how many years?
Rocks in ocean crust are generally as old as 200 million years. The oldest oceanic crust is found near continents, which can be around 250 million years old. However, most of the oceanic crust is continually being formed and destroyed through seafloor spreading and subduction, so rocks are often much younger.
What is a hollow area formed in a cliff wall along the ocean?
The ocean's waves have washed away the rock over many years.
What features of the ocean floor is the deepest?
The ocean basins are the result of tectonic forces and processes. All of the ocean basins were formed from volcanic rock that was released from fissures located at the mid-oceanic ridges. The oldest rocks found in these basins are approximately 200 million years old. This is a lot younger than the oldest continental rocks which have ages greater than 4 billion years. The reason for this discrepancy is simple. Tectonic processes destroy old oceanic rocks! Oceanic rock is returned to the Earth's mantlewhen oceanic crust is subducted. Many of these subduction zones occur at the continental marginswhere oceanic crust meets continental crust. Subduction also creates the ocean's deep trenches.
What is the continental crust made out of?
continental crust is made of many rocks such as granite
How many types of rock make up earth crust?
3
What rock is in Earth's crust?
Can't pick just one. The Earth is made up of many rock types.
How many years is the Pacific Ocean?
I would like to know how many years old the Pacific Ocean...!
What does magnetic striping tell us about the age of rocks?
If you know how many stripes away from the mid-ocean ridge the rock is and you know how frequently the earth's poles flip you can use the stripes like rings on a tree to measure the age of that rock.
How many layers are there in the earth's crust?
The crust alone contains millions of different layers of sedimentary rock. For the layers of the Earth, some of which are rock and some of which are not, see the related link below.
