Here's why:
* Crust: The outermost layer of the Earth, it's relatively thin and is composed primarily of igneous, sedimentary, and metamorphic rocks. These rocks are rich in silicon and aluminum, forming minerals like feldspar and quartz.
* Mantle: The layer beneath the crust, it's mostly composed of silicate minerals, but with higher proportions of iron and magnesium compared to the crust.
* Core: The Earth's inner and outer core are primarily composed of iron and nickel.
Let me know if you have any other questions about the Earth's layers!
