what are the similarities and differences btween oceanic/continental crust?

Question

List it down or suggest a site, please.

thanks soo much

Answer 1

OCEANIC CRUST
Oceanic crust is the part of Earth's lithosphere which surfaces in the ocean basins. Oceanic crust is composed of mafic basaltic rocks, or sima. It is thinner, generally less than 10 kilometers thick, but more dense than the continental crust, or sial, having a mean density of about 3.3 grams per cubic centimeter.

Most of the present day oceanic crust is less than 200 million years old because it is continuously being created at oceanic ridges and destroyed by being pulled back under the continental crust in subduction zones by the convection currents in the lower mantle. Plate tectonics is the study of these processes.

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.The average density of the continental crust is 2.7g/cm³. It is less dense than the material of the Earth's mantle and thus "floats" on top of it. 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.

As a consequence of the density difference, when active margins of continental crust meet oceanic crust in subduction zones, the oceanic crust is typically subducted back into the mantle. Because of its relative low density, continental crust is only rarely subducted or re-cycled back into the mantle (for instance, where continental crustal blocks collide and overthicken, causing deep melting). For this reason the oldest rocks on Earth are within the cratons or cores of the continents, rather than in repeatedly recycled oceanic crust; the oldest continental rock is the Acasta Gneiss at 4.01 Ga, while the oldest oceanic crust is of Jurassic age.

Answer 2

The big differences are that continental crust is a lot thicker (always -- that's what makes them continents) and older (as a general rule with exceptions, because in most cases crust is created and destroyed in oceans).

Search on "plate tectonics" or "continental drift" for more detail.

Answer 3

Domino's will only do continental crust on a large pizza, but you can get oceanic crust on all sizes.