Earthquakes/Volcanoes
Structure of the Earth
Crust
Plates
Mantle
Outer Core
Inner Core
The layer of Molten rock that lies between the core and the crust.
The Earth's rocky surface. It is the bit that you live on. 40km thick (dry land). 6 - 10km (seabed)
The crust's cracked into little pieces. Like a hard - boiled egg that you have bashed with a spoon.
A boiling hot layer of liquid metal.
The centre of the Earth. Extreme pressure meaning that it is solid.
Tectonic Plates
A Tectonic plate is a fragment of the Earth's crust.
How do convention currents in the mantle move? The heated magma moves up to the Earth's crust and goes around. it then starts to cool down and moves back, this is what stretches the Earth's tectonic plates.
magma
The thickest layer of the Earth is the crust. The mantle is made up of melted rock. The inner core reaches a temperature of 4000c. Closer to the centre of the Earth, the temperature becomes higher.
This is molten rock in the mantle/
Tectonic Plate
Large fragments of the crust, floats on the magma in the mantle.
The Earth is made up of lots of plates so it is a bit like a jigsaw. They are in constant slow motion. The ocean floor are continuously moving.
Plate Boundaries
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How can we prove that the Earth has moved? The Earth's crust is split into large sections. They are called plates. They float on the mantle and move about a bit. People believe a theory that 250 million years ago all the land was joined together to form a big massive continent . It was called Pangaea. then the plates started to move and split up and this is how we know the world today.
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