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Why do composite volcanoes occur at the boundary between oceanic crust and continental crust?
Composite volcanoes, also known as stratovolcanoes, occur at convergent plate boundaries where oceanic crust subducts beneath continental crust. The subduction of denser oceanic crust triggers the melting of rocks in the mantle, leading to the formation of viscous magma that erupts explosively through the continental crust, creating composite volcanoes with alternating layers of lava and ash.
Are oceanic plates only made up of oceanic crust?
yes but oceanic crust is younger than continental crust because of deep sea trenches
What is a characteristic of subduction?
The correct answers are - B. Where oceanic crust meets continental crust, and C. Earthquakes.Subduction zones appear only on places where a crust of lower density (oceanic crust) meets a crust of higher density (continental crust).On the places where the oceanic crust meets the continental crust, the oceanic crust goes beneath the continental crust, this makes changes and readjustments in the inner part of the crust, and plus there's significant pressure from the mantle layer from beneath, so earthquakes are a very common occurrence.Check all that apply. A. Broad river deltas B. Where oceanic crust meets continental crust C. Earthquakes D. Two continents collide
How many times thicker is the continental crust to the oceanic crust?
The continental crust is about 35 to 40 kilometers thick, while the oceanic crust averages at about 7-10 kilometers thick. This means that the continental crust is about 3.5 to 4 times the thickness of the oceanic crust.
Where do volcanoes occur most frequentley?
Volcanoes occur most frequently at tectonic plate boundaries, such as the Ring of Fire in the Pacific Ocean. This is where the Earth's crust is either spreading apart, colliding, or sliding past each other, leading to the formation of magma chambers that can erupt as volcanoes.
Does sea-floor spreading occur in oceans only?
It occurs in the oceanic crust!!!
Why do composite volcanoes occur at the boundary between oceanic crust and continental crust?
Composite volcanoes, also known as stratovolcanoes, occur at convergent plate boundaries where oceanic crust subducts beneath continental crust. The subduction of denser oceanic crust triggers the melting of rocks in the mantle, leading to the formation of viscous magma that erupts explosively through the continental crust, creating composite volcanoes with alternating layers of lava and ash.
Are oceanic plates only made up of oceanic crust?
yes but oceanic crust is younger than continental crust because of deep sea trenches
Does an earthquake occur only in continental crust?
No, earthquakes can occur in both continental crust and oceanic crust. Earthquakes are caused by the movement of tectonic plates, which can happen in any regions where these plates interact, whether on land or under the ocean.
Why are there volcanoes popping up everywhere?
They do not pop up everywhere. they only occur along the fault lines (where the plates that form the earth's crust meet). Volcanoes have been occurring along fault lines since the creation of the earth's crust (billions of years)
What is a characteristic of subduction?
The correct answers are - B. Where oceanic crust meets continental crust, and C. Earthquakes.Subduction zones appear only on places where a crust of lower density (oceanic crust) meets a crust of higher density (continental crust).On the places where the oceanic crust meets the continental crust, the oceanic crust goes beneath the continental crust, this makes changes and readjustments in the inner part of the crust, and plus there's significant pressure from the mantle layer from beneath, so earthquakes are a very common occurrence.Check all that apply. A. Broad river deltas B. Where oceanic crust meets continental crust C. Earthquakes D. Two continents collide
What is the difference of continental crust and oceanic crust?
Two differences are that the oceanic crust is more dense than continental, and continental crust is composed mostly of granite, while oceanic is mostly basalt
Which plates includes only oceanic crust with no continents?
The plates that include only oceanic crust with no continents are the Pacific Plate, Nazca Plate and the Juan de Fuca Plate. These plates are mainly composed of basaltic oceanic crust and are located in the ocean basin areas.
How many times thicker is the continental crust to the oceanic crust?
The continental crust is about 35 to 40 kilometers thick, while the oceanic crust averages at about 7-10 kilometers thick. This means that the continental crust is about 3.5 to 4 times the thickness of the oceanic crust.
Where do volcanoes occur most frequentley?
Volcanoes occur most frequently at tectonic plate boundaries, such as the Ring of Fire in the Pacific Ocean. This is where the Earth's crust is either spreading apart, colliding, or sliding past each other, leading to the formation of magma chambers that can erupt as volcanoes.
Is oceanic crust wider than continental crust?
If you meant thicker, the answer is no: Continental crust is much thicker than Oceanic crust. This is because the oceanic crust is formed very quickly, at an ocean ridge, for example, where the lava gradually erupts. The continental crust, on the other hand, is like a river delta: over time, it grows in height as more material is added on top (by volcanoes and other intrusions, as well as other uplifting processes). The reason why we can't touch the Moon is because uplift and eruptions are balanced by weathering and erosion. Therefore, the thickness is regulated by an equilibrium, and this causes the crust to be thick. The thickness of the oceanic crust is not regulated in such a way, but additions to its thickness are irrelevant as the oceanic crust is very quickly subducted again. Millions of years ago, there was a small sea between Britain and the Laurentine continent. This consisted of Oceanic crust. It was then very quickly consumed again when the plates changed their direction. The same could happen, in theory, to the Atlantic Ocean. Only time will tell...
Do hot spots only form in oceanic crust?
No, hot spots can form in both oceanic and continental crust. Hot spots are areas of high volcanic activity that are thought to be caused by a deep-seated mantle plume that rises to the surface, creating a localized area of magma upwelling. These hot spots can create volcanic islands, such as the Hawaiian Islands, regardless of whether they are in oceanic or continental crust.
