is the earth's core made of iron
The Earth is made out of many things. Deep inside Earth, near its center, lies Earth's core which is mostly made up of nickel and iron. Above the core is Earth's mantle, which is made up of rock containing silicon, iron, magnesium, aluminum, oxygen and other minerals. The rocky surface layer of Earth, called the crust, is made up of mostly oxygen, silicon, aluminum, iron, calcium, sodium, potassium and magnesium. Earth's surface is mainly covered with liquid water and its atmosphere is is mainly nitrogen and oxygen, with smaller amounts of carbon dioxide, water vapor and other gases.
Scientists studying earths interior believe the inner core is 90% iron with the remaining 10% iron mixed with nickel, oxygen, sulfur or a combination of these elements. The inner core is also suspended in the molten outer core and revolves slightly faster than the rest of the planet.