The oceanic crust is generally hottest at mid-ocean ridges, where tectonic plates are diverging, and magma rises to create new crust. As you move away from these ridges, the crust cools gradually due to the increasing distance from the heat source. Additionally, areas near subduction zones, where the oceanic crust is being forced down into the mantle, can also experience increased temperatures due to geothermal gradients.
The crust is the least dense portion of the solid Earth because it is the thinnest layer.
The average density of oceanic crust is about 2.9 g/cm^3. Given that oceanic crust is typically around 7 km thick, the weight of a cubic meter of oceanic crust would be approximately 29,000 kg (or 29 metric tons).
I believe this would be the oceanic crust
Oceanic crust is created at mid-ocean ridges and (through the creation of new oceanic crust) is pushed toward a convergent plate boundary where it is subducted. So the oldest oceanic crust would be located at a convergent plate boundary where the oceanic crust is being subducted under continental crust.
If a layer of the crust is pushed up which of the following changes would you expect to see?
oceanic crust
The crust is the least dense portion of the solid Earth because it is the thinnest layer.
The lithosphere is composed of crust and hard upper mantle. The oceanic lithosphere would be hard upper mantle and basaltic oceanic crust.
The lithosphere is composed of crust and hard upper mantle. The oceanic lithosphere would be hard upper mantle and basaltic oceanic crust.
The average density of oceanic crust is about 2.9 g/cm^3. Given that oceanic crust is typically around 7 km thick, the weight of a cubic meter of oceanic crust would be approximately 29,000 kg (or 29 metric tons).
Of course it's continental crust! If it were made of oceanic crust, it would be underwater or some large island starting at the bottom of the ocean floor!
I believe this would be the oceanic crust
I believe this would be the oceanic crust
Iceland
Somewhere at the bottom of the Marianas Trench you would find the oldest rock of the oceanic crust. Somewhere else, however, there are older rocks on the ocean floor--those deposited by icebergs that have broken off of glaciers. Those erratic rocks could be much older than the oldest oceanic crust.
Somewhere at the bottom of the Marianas Trench you would find the oldest rock of the oceanic crust. Somewhere else, however, there are older rocks on the ocean floor--those deposited by icebergs that have broken off of glaciers. Those erratic rocks could be much older than the oldest oceanic crust.
Continental crust is less dense than oceanic crust, so it floats higher on the mantle. This means that the same thickness of continental crust will displace less mantle compared to oceanic crust. Additionally, continental crust is composed of lighter rocks like granites, while oceanic crust is made of denser rocks like basalt.