RocksAreForever

Rocks Are Forever

The Crust makes up less than 1% of the Earth’s mass (0.4%)
It is made of oxygen, magnesium aluminum, silicon calcium, sodium potassium, iron.
There are 8 elements that make up 99% of the Earth’s crust.
The continents are about 35 km thick and the ocean floors are about 7 lm thick.
The Mantle is the solid casing of the Earth and is about 2900 km thick.
It makes up about 70% of the Earth’s mass (68.1%).
It is made up of silicon, oxygen, aluminum and iron.
The Core is mainly made of iron and nickel and makes up about 30% of the Earth’s mass (31.5%).
The Outer Core is 2200 km thick and is liquid and the Inner core is 1270 km thick and is solid.