What is the earth made of?
Diagram to show a slice through the earth.
The earth is made up _______ layers.
1. The CRUST
This is the layer we _________ on. It is a thin skin of ________around
the ________.
2. The MANTLE
The mantle forms about _________ of the earth. It is made of
____________ rock.
The upper mantle is __________. The rock below it is _________ and
_________ like soft ___________. It is ____________ in places.
3. The CORE
The core is mainly ___________ mixed with a little bit of
______________. The outer core is _________________ and the inner
core is ______________.
Look at the diagram of the earth’s core and answer these questions.
1.
2.
3.
4.
How thick is the crust? ___________
How wide is the mantle? ___________
Which part of the core is liquid? ______________
What is the outer core made of? ______________ and
____________
5. How wide is the inner core? ____________
6. Add up all the distances and work out how far it is from the
surface of the earth to the centre core. (You can use a
calculator)
How did the layers form?
Some time after the ___________ formed, it got so ________
that everything inside _____________. The _____________
substances in the liquid ___________ and the
_____________ substances rose to form ______________.
As the earth ______________ most of them turned
______________.
A great deal of __________ is still ____________ inside the
earth and it gets ____________ as you go down deeper. At
200km deep the rocks are ____________________________.
At the centre of the earth the temperature is
_____________.