Is continental plate heavier than oceanic plate
Because of their heavy ferromagnesian elements, oceanic plates are much denser than continental plates.
The average density of ocean plates is approximately 200 pounds per cubic foot, while continental crust ranges between about 162 and and 172 pounds per cubic foot..
What are three differences between oceanic and continental crust
What is the difference between Oceanic and Continental Crust? Oceanic crust is dominated by mafic and ultramafic intrusive igneous rocks whereas continental rocks are dominated by granitic (felsic) intrusive igneous rocks. … The continental crust is by far the older of the two types of crust.
What are the similarities between oceanic crust and continental crust
Oceanic and Continental crusts are alike because they both shift and move and grow. They differ by there rock types. Oceanic crust is made up of dense basalt while continental crust is made up of less dense granite.
Why do oceanic plates go under continental plates
Oceanic-Continental Plate Convergence When an oceanic plate collides with a continental plate the crust forming the oceanic plate gets bent and pulled under the continental crust. This is because the rocks that form the oceanic crust are denser and thinner than the rocks that form the continental crust.
Which is heavier continental or oceanic crust
Both oceanic crust and continental crust are less dense than the mantle, but oceanic crust is denser than continental crust. This is partly why the continents are at a higher elevation than the ocean floor. … The oceanic crust is formed by partial melting of the mantle at mid-ocean ridges.
Why is oceanic crust heavier than continental crust
Oceanic crust is denser because it generally melts to a higher fraction than continental crust. … When rocks melt to 20–30% like they do at mid-ocean ridges, the result is more dense than when rocks melt to form continental plates, which is typically 1–5%.
What are the characteristics of the continental crust
Continental crust is broadly granitic in composition and, with a density of about 2.7 grams per cubic cm, is somewhat lighter than oceanic crust, which is basaltic (i.e., richer in iron and magnesium than granite) in composition and has a density of about 2.9 to 3 grams per cubic cm.
Why is continental crust less dense
Continental crust is less dense because of its composition. Continental crust is made up of felsic material (SiO4)– mainly granite. … Oceanic crust, while thinner, is made of mafic materials (Fe, Mg)– mainly basalt. The density of oceanic crust is 3.0g/cm^3.
What are the 7 major plate tectonics
There are major, minor and micro tectonic plates. There are seven major plates: African, Antarctic, Eurasian, Indo-Australian, North American, Pacific and South American.
What are 2 oceanic plates
An example of an oceanic plate is the Pacific Plate, which extends from the East Pacific Rise to the deep-sea trenches bordering the western part of the Pacific basin. A continental plate is exemplified by the North American Plate, which includes North America as well as the oceanic crust…
What is the difference between oceanic and continental lithosphere
Oceanic lithosphere is typically about 50-100 km thick (but beneath the mid-ocean ridges is no thicker than the crust). The continental lithosphere is thicker (about 150 km). … The new oceanic lithosphere is constantly being produced at mid-ocean ridges and is recycled back to the mantle at subduction zones.
What is the heaviest type of crust
The continental crust is composed mostly of granite. The oceanic crust consists of a volcanic lava rock called basalt. Basaltic rocks of the ocean plates are much denser and heavier than the granitic rock of the continental plates. Because of this the continents ride on the denser oceanic plates.
Why is the continental crust important
Importance. Because the surface of continental crust mainly lies above sea level, its existence allowed land life to evolve from marine life.
What is an example of continental crust
The continental crust is the layer of granitic, sedimentary and metamorphic rocks which form the continents and the areas of shallow seabed close to their shores, known as continental shelves. … About 40% of the Earth’s surface is now underlain by continental crust.
What will happen when oceanic and continental crust collide
When an oceanic and a continental plate collide, eventually the oceanic plate is subducted under the continental plate due to the high density of the oceanic plate. … As time goes on the hot magma rising upward from the subduction zone causes further compression of the mountain belt.
How are the continental crust and oceanic crust different
It is the solid rock layer upon which we live. It is either continental or oceanic. Continental crust is typically 30-50 km thick, whilst oceanic crust is only 5-10 km thick. Oceanic crust is denser, can be subducted and is constantly being destroyed and replaced at plate boundaries.