1. Imagine a journey to the centre of the Earth…
8.1a Inside volcanoes
Imagine a journey to the centre of the Earth…
First, you travel through 40 km of solid rock – the crust
crust

2. Imagine a journey to the centre of the Earth…
8.1a Inside volcanoes
Imagine a journey to the centre of the Earth…
Then, nearly km of denser solid rock – the mantle
mantle

3. Imagine a journey to the centre of the Earth…
8.1a Inside volcanoes
Imagine a journey to the centre of the Earth…
Next, km of very hot liquid rock – the outer core
Liquid iron outer core

4. Imagine a journey to the centre of the Earth…
8.1a Inside volcanoes
Imagine a journey to the centre of the Earth…
Finally, more than km of solid iron- nickel alloy.
Congratulations! You have reached the centre of the inner core.
Solid iron inner core

5. 8.1a Inside volcanoes Inside the Earth crust mantle
liquid iron outer core
solid iron inner core

6. 8.1a Inside volcanoes Inside volcanoes
The rocks under volcanoes are very hot. They melt to make magma.
Magma collects under and inside volcanoes in magma chambers.

7. 8.1a Inside volcanoes Eruption! Pressure builds up in magma chambers.
The pressure forces magma out of the volcano, along with gases, ash and bigger pieces of solid rock.

8. 8.1a Inside volcanoes Magma or lava?
Liquid rock under the ground, and in volcanoes, is called magma.
Once liquid rock has left the volcano, and is on the surface of the Earth, it is called lava.