What’s inside the Earth?

Following on from our solar system themed activities is this easy play dough model of the Earth. My 7 year old wasn’t very impressed when I showed him my Earth model, but once I carved it open declared it to be ‘quite cool’. It’s not perfect and not really to scale ( the playdough was quite squishy, but clearly shows the inner core ( marble ), outer core ( orange ), mantle ( yellow) and crust ( green ).

Five minutes later everyone was wrapping play dough around a marble trying to copy my model, so I think it was a success.

whats's inside earth


Facts about the Earth

Inner Core

Did you know the inner core is a huge metal ball about 2500 kilometers wide. The metal stays solid because of a massive amount of pressure surrounding it.

Temperature: 5,000°C – 6,000°C

State: Solid

Composition: iron and nickel

Outer Core

Did you know the liquid outer core 5150 kiometers deep and it’s the movement of the metals in it that create the Earth’s magnetic field.

Temperature: 4,000°C – 6,000°C

State: Liquid

Composition: iron, nickel, sulphur and oxygen

Mantle – the mantle is actually split into two parts.

Lower Mantle

Did you know the lower mantle is found between 670km and 2,890km below the Earth’s surface.

Temperature: 3,000°C

State: solid

Composition: iron, oxygen, silicon, magnesium and aluminium

Upper Mantle

The upper mantle is 670km below the surface of the Earth. The rock here is stiffer than the lower mantle because it is not as hot.

Temperature: 1,400°C – 3,000°C

State: liquid / solid

Composition: iron, oxygen, silicon, magnesium and aluminium


Temperature: Around 22°C

State: Solid

Composition: Oceanic crust ( beneath the ocean bed )made up of iron, oxygen, silicon, magnesium and aluminium.

Continental crust ( land ) made up of granite, sedimentary rocks and metamorphic rocks.

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what's inside earth

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