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what what
Usually referred to as a plate.
The tectonic plates.
Plate
a volcanic mountain is a cone shaped mountain formed when molten rocks erupts from a hole in the earths crust.
all of it it is the lower part of it
The earths crust is a part of the outermost layer.
Silicon is a mixture of the minerals of the earths crust. so.... silicon isn't something from the earths crust. -thanks for your question.
thinner and denser
The Earths crust is approximately 650 km deep.
how wide is the earths crust
The abundance of neodymium in the earths crust is approx. 40 ppm.