- Where is the oceanic crust found?
- What is the thinnest part of oceanic crust?
- What can you conclude about the oceanic crust?
- What does the oceanic crust do?
- What can you say about the ages of oceanic crust near and far from the mid ocean ridge Brainly?
- What is oceanic crust made up of?
- Is the oceanic crust thicker than the continental crust?
- What is an example of oceanic crust?
- What are the similarities and differences between oceanic crust and continental crust?
- What are the characteristics of oceanic plates?
- What is the importance of seafloor spreading?
- Why is continental crust so much thicker than oceanic crust?
- Why is oceanic crust so dense and heavy?
- Why is the earth not getting bigger despite the fact that?
- What are the lines of evidence that support the plate movement Brainly?
Where is the oceanic crust found?
Oceanic crust, the outermost layer of Earth’s lithosphere that is found under the oceans and formed at spreading centres on oceanic ridges, which occur at divergent plate boundaries.
A cross section of Earth’s outer layers, from the crust through the lower mantle..
What is the thinnest part of oceanic crust?
PROVIDENCE, R.I. — Scientists say they have discovered the thinnest portion of the Earth’s crust — a 1-mile thick, earthquake-prone spot under theAtlantic Ocean where the American and African continents connect. … Detrick of the University of Rhode Island.
What can you conclude about the oceanic crust?
The denser oceanic plate is getting subducted beneath the other and there occurs a trench which lies relatively at a lower elevation than the continental crust. The oceanic crust usually is composed of basalt and it does not exert any upward force towards the continental crust.
What does the oceanic crust do?
It creates the crust of the Earth we walk on, and the crust that lies at the ocean floor. 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.
What can you say about the ages of oceanic crust near and far from the mid ocean ridge Brainly?
Answer: The age, density, and thickness of oceanic crust increases with distance from the mid-ocean ridge. … Eventually, older oceanic crust encounters a tectonic boundary with continental crust.
What is oceanic crust made up of?
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.
Is the oceanic crust thicker than the continental crust?
Earth’s crust is generally divided into older, thicker continental crust and younger, denser oceanic crust.
What is an example of oceanic crust?
An example of this is the Gakkel Ridge under the Arctic Ocean. Thicker than average crust is found above plumes as the mantle is hotter and hence it crosses the solidus and melts at a greater depth, creating more melt and a thicker crust. An example of this is Iceland which has crust of thickness ~20 km.
What are the similarities and differences between oceanic crust and continental crust?
Layers that are less dense, such as the crust, float on layers that are denser, such as the mantle. 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 are the characteristics of oceanic plates?
Oceanic plates are mafic in nature, composed of basalt rock and its coarse-grained equivalent, gabbro, both rich in iron, magnesium and calcium. In contrast, continental plates are felsic in nature, dominated by granitic rock with its abundant silica, aluminum, sodium and potassium.
What is the importance of seafloor spreading?
Significance. Seafloor spreading helps explain continental drift in the theory of plate tectonics. When oceanic plates diverge, tensional stress causes fractures to occur in the lithosphere.
Why is continental crust so much thicker than oceanic crust?
The continental crust is also less dense than oceanic crust, although it is considerably thicker. … Because of its relative low density, continental crust is only rarely subducted or recycled back into the mantle (for instance, where continental crustal blocks collide and over thicken, causing deep melting).
Why is oceanic crust so dense and heavy?
Oceanic crust is denser because it generally melts to a higher fraction than continental crust. … Generally lighter minerals melt before denser ones. 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%.
Why is the earth not getting bigger despite the fact that?
New crust is continually being pushed away from divergent boundaries (where sea-floor spreading occurs), increasing Earth’s surface. But the Earth isn’t getting any bigger. … Deep below the Earth’s surface, subduction causes partial melting of both the ocean crust and mantle as they slide past one another.
What are the lines of evidence that support the plate movement Brainly?
Answer: Evidence for Plate Tectonics: Evidence for ocean-spreading episodes includes symmetrical magnetic anomalies parallel to mid-ocean ridges, zones of large earthquakes, active volcanoes at some ocean margins, and the distribution of animals in the world (e.g. the restriction of certain mammal groups to Australia).