1. The oceanic crust is made up of basalt while the continental crust is made up of granite. 2. The oceanic crust is thinner while the continental crust is much thicker.
What are two differences between oceanic crust and continental crust quizlet?
The oceanic crust is thinner and denser, and is similar in composition to basalt (Si, O, Ca, Mg, and Fe). The continental crust is thicker and less dense, and is similar to granite in composition (Si, O, Al, K, and Na). The mantle is made of magnesium, iron and silicon.
What’s the difference between the continental crust and the oceanic crust?
Oceanic crust differs from continental crust in several ways: it is thinner, denser, younger, and of different chemical composition. Like continental crust, however, oceanic crust is destroyed in subduction zones. The lavas are generally of two types: pillow lavas and sheet flows.
What are 3 differences between oceanic and continental crust?
What are three differences between continental and oceanic crust? Continental crust is low in density whereas oceanic crust has a higher density. Continental crust is thicker, on the contrary, the oceanic crust is thinner. Continental crust floats on magma freely but oceanic crust floats on magma scarcely.
What are the differences between continental and oceanic plates?
Continental plates are much thicker that Oceanic plates. At the convergent boundaries the continental plates are pushed upward and gain thickness. The rocks and geological layers are much older on continental plates than in the oceanic plates. The Continental plates are much less dense than the Oceanic plates.
What is the difference between oceanic crust and continental crust Why do we care about what type of crust covers a tectonic plate?
Continental crust is thicker than oceanic crust, continental crust is less dense than oceanic crust, the oldest continental crust is older than the oldest oceanic crust, plus the continental crust is composed of a variety of rock types, whereas oceanic crust is composed of basalt and gabbro.
What are the main differences 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). It consists of about 50 km of crust and 100 km or more of the uppermost mantle.
What are the differences between continental and oceanic lithosphere How are they similar?
The continental lithosphere is thicker (about 150 km). … The oceanic lithosphere consists mainly of mafic crust and ultramafic mantle and is denser than the continental lithosphere, for which the mantle is associated with a crust made of felsic rocks.
Is oceanic crust and oceanic lithosphere are same?
The crust is the thin, outermost layer of the Earth that is composed differently than the mantle. The lithosphere is a thick layer that contains both the crust and the upper mantle (which is rigid compared to the underlying asthenosphere).
What is the oceanic crust?
Oceanic crust is the part of the Earth’s crust that makes up the seafloor. It’s thinner, denser, and simpler in structure than the continental crust. Oceanic crust is also younger, on average, from its birth at a mid-ocean ridge to its end at a subduction zone is no more than 250 million years.
How do the differences between continental and oceanic crust affect the way plates interact?
Differences in Formative Process
Continental plates, meanwhile, are formed primarily by convergent plate boundaries. These zones represent areas where oceanic plates collide with and plunge underneath continental plates – a process called subduction. As oceanic plates subduct, they melt to form magma.
When continental and oceanic plates collide?
When an ocean plate collides with another ocean plate or with a plate carrying continents, one plate will bend and slide under the other. This process is called subduction. A deep ocean trench forms at this subduction boundary.
What is the difference between crust and lithosphere?
Hence, whilst the crust is an integral part of the lithosphere, the lithosphere is mainly composed of mantle rocks. This is why authors sometimes state, loosely, that the lithosphere is the uppermost part of the mantle – they are choosing to disregard the thin veneer of crustal rocks.
Is oceanic crust older than continental crust?
Continental crust is almost always much older than oceanic crust. Because continental crust is rarely destroyed and recycled in the process of subduction, some sections of continental crust are nearly as old as the Earth itself.
What is a continental crust?
continental crust, the outermost layer of Earth’s lithosphere that makes up the planet’s continents and continental shelves and is formed near subduction zones at plate boundaries between continental and oceanic tectonic plates. The continental crust forms nearly all of Earth’s land surface.
Is oceanic crust younger than continental crust?
The oceanic crust is younger than the continental crust, largely because of subduction. The oceanic crust can be destroyed or recycled by divergent plate boundaries and convergent boundaries through which subduction occurs. Moreover, when two tectonic plates collide, they push the oceanic crust to the mantle.
Is continental crust thinner than oceanic crust?
Oceanic crust is generally composed of dark-colored rocks called basalt and gabbro. It is thinner and denser than continental crust, which is made of light-colored rocks called andesite and granite. The low density of continental crust causes it to “float” high atop the viscous mantle, forming dry land.
What does a continental and oceanic crust collision create?
When an oceanic and continental plate collide what is the resulting feature? Plates Subduct When an ocean plate collides with another ocean plate or with a plate carrying continents, one plate will bend and slide under the other. This process is called subduction. A deep ocean trench forms at this subduction boundary.
What happens when two oceanic crusts meet?
When two oceanic plates converge, the denser plate will end up sinking below the less dense plate, leading to the formation of an oceanic subduction zone. … Whenever a subduction zone is formed, the subducted plate will end up being partially melted by the earth’s internal magma and molten.
When an oceanic crust meets continental crust What occurs?
When oceanic crust converges with continental crust, the denser oceanic plate plunges beneath the continental plate. This process, called subduction, occurs at the oceanic trenches. The entire region is known as a subduction zone. Subduction zones have a lot of intense earthquakes and volcanic eruptions.
What are the primary differences between the two parts of the crust?
There are two types of crust, oceanic and continental. Oceanic crust is denser and thinner and mainly composed of basalt. Continental crust is less dense, thicker, and mainly composed of granite. The mantle lies below the crust and is up to 2900 km thick.
How do these two crust differ?
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.
What is the difference between crust and plates?
The crust is the surface of the Earth. It is a rock layer forming the upper part of the lithosphere . The lithosphere is split into tectonic plates.
Why continental crust is lighter than oceanic crust?
Why is it that continental crust is less dense than oceanic, where in fact continental crust is thicker than oceanic crust? You’ve got it backwards. Continents are continents because they’re less dense, and so ‘float’ above the denser oceanic crust.
Why does the oceanic crust sink?
It is due to the process of subduction, oceanic crust tends to get colder and denser with age as it spreads off the mid-ocean ridges. It gets so dense, that it sinks in the upper mantle (subduction).
Is oceanic or continental crust heavier?
Continental crust is also less dense than oceanic crust, though it is considerably thicker, mostly 35 to 40 km versus the average oceanic thickness of around 7-10 km. About 40% of the Earth’s surface is now underlain by continental crust.
How will you differentiate continental crust from oceanic crust base your answer by using the table below?
Continental crust is low in density whereas oceanic crust has a higher density. Continental crust is thicker, on the contrary, the oceanic crust is thinner. Continental crust floats on magma freely but oceanic crust floats on magma scarcely.
Where can you find oceanic and continental crust?
The Earth has three different layers to it. The crust is the part of the Earth right on top where people live. The crust is subdivided into two types, oceanic and continental. Oceanic crust is found under oceans, and it is about four miles thick in most places.