Imagine a journey to the centre of the Earth…

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Presentation transcript:

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

Imagine a journey to the centre of the Earth… 8.1a Inside volcanoes Imagine a journey to the centre of the Earth… Then, nearly 3 000 km of denser solid rock – the mantle mantle

Imagine a journey to the centre of the Earth… 8.1a Inside volcanoes Imagine a journey to the centre of the Earth… Next, 2 000 km of very hot liquid rock – the outer core Liquid iron outer core

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 1 000 km of solid iron- nickel alloy. Congratulations! You have reached the centre of the inner core. Solid iron inner core

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

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.

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.

8.1a 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.