Yes, that's correct! The Earth's crust is divided into two main types: oceanic crust and continental crust.
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Oceanic Crust:
- This type of crust is found beneath the oceans.
- It is generally thinner (around 5-10 kilometers thick) than continental crust.
- Oceanic crust is primarily composed of basalt, a dense volcanic rock.
- It is continually being created at mid-ocean ridges and recycled back into the mantle at subduction zones.
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Continental Crust:
- This crust makes up the continents and the shallow seabed along the coastlines.
- It is thicker (averaging about 30-50 kilometers, but can be up to 70 kilometers in some mountainous regions).
- Continental crust is composed mainly of lighter rocks, such as granite, and includes a wider variety of rock types than oceanic crust.
- It is generally older and more complex in terms of geological history.
These two types of crust form the outermost layer of the Earth and play a crucial role in the planet's geology, including plate tectonics, which involves the movement of these crustal plates.