Earth's core is made primarily of iron and nickel.
The most dense substances are typically found in the Earth's inner core, which is primarily composed of iron and nickel. Above the inner core is the outer core, which is also dense but in a molten state. In terms of atmospheric layers, the densest layer is the troposphere, where most of the atmosphere's mass is concentrated.
You would find the Earth in layers: First the crust on the outer region, the huge molten mantle, the outer core and last but not at all least the inner core which is debated whether or not it is solid or liquid.
The most dense layer of the Earth is the inner core, located at the center of the Earth. It is composed primarily of solid iron and nickel, making it the densest part of our planet.
Iron is most commonly found in the Earth's core, particularly in the outer and inner core layers. The outer core is primarily composed of liquid iron and nickel, while the inner core is made up of solid iron. Additionally, smaller amounts of iron can also be found in the mantle and crust, but the majority resides in the core.
To be precise, there is actually an outer core and an inner core. You can find the details in the Wikipedia article "Structure of the Earth".
The answer is we know what it is because if you Google it up you will find it says the heatness of the earth's inner core is why.
They measure how waves from earthquakes travel through the earth, and they test how waves travel through liquid and solid and goo, and they compare the results to find the consistency of the inner core and other layers of the earth.
you would find magma and lava because the rocks cousin them to turninto lava that is what you would find at the core of the earth
atmosphere/hydrospherelithosphereasthenospheremantleouter coreinner core(you could divide these further, but the above are the main 6 layers)
The four main sections of the Earth are the inner core, outer core, mantle, and crust. The inner core is solid and composed mainly of iron and nickel. The outer core is liquid, while the mantle is a semi-solid layer between the core and crust. The crust is the Earth's outermost layer, where we find continents, oceans, and landforms.
You can find the most Iron and nickel in the earth's inner and outer core.
Inside a Castle.