Science quiz
Layers of the Earth and atmosphere in order
Nine layers, from the centre of the Earth to the edge of space. Put them in order, deepest first.
- Format
- Put them in order
- Items
- 9 to sort
- Limit
- None
- Level
- Medium
- Checked
- 2026.10.03
See every entry and put the whole list in order.
- Entries
- 9
- Sort by
- Extent
- Time limit
- None
- Touch screens start in Tap mode: tap the entries in order, and tap one again to take it back.
- Drag mode: drag an entry (press and hold on a phone), or use the arrow buttons.
- Keyboard: space to pick up, arrows to move, space to drop.
- Pause whenever you like (Esc). The board hides while the clock is stopped.
About this quiz
The Earth has four main layers: a solid inner core, a liquid outer core, a thick mantle and a thin crust. Above the surface, the atmosphere is divided into five layers of its own.
- The mantle is by far the thickest layer of the Earth's interior, at roughly 2,900 km.
- The crust under the oceans is only about 5 km thick.
- The troposphere, the lowest layer of the atmosphere, reaches about 12 km on average.
Sources
- [1]U.S. Geological Survey. This Dynamic Earth: Inside the Earth.
- [2]NASA. Earth's atmosphere: a multi-layered cake.
Note on the data. The four interior layers and their thicknesses follow the USGS publication This Dynamic Earth; the five atmospheric layers and their altitude ranges follow NASA. Both were checked on 3 October 2026.
Last checked October 3, 2026
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