Metamorphic rocks are formed deep within the earth's crust under conditions of high heat and pressure. Sedimentary rock layers sink over time, heating up and experiencing increasing weight as they move closer to the center of the earth, transforming them into metamorphic rocks. These metamorphic rocks can be exposed at the surface through mountain building when tectonic plates collide and push rock upwards, or through erosion of overlying rock over time. Examples of metamorphic rocks include slate, marble, and greenstone.

1. All you need to know

2. 
Metamorphic rocks are rocks that are
changed by heat and pressure.

3. 

Metamorphic rocks are rocks that are
changed by heat and pressure.
They are made deep in the earths crust.
Metamorphic rock
Being made close to the
Next layer of the earth
The earth’s crust
(outside bit)

4. 
A layer of sedimentary rock slowly sinks
closer and closer to the centre of the earth
Sedimentary rock
sinking
The earth’s crust
(outside bit)

5. 

A layer of sedimentary rock slowly sinks
closer and closer to the centre of the earth
As it gets closer to the centre the rock gets
heated up.
Sedimentary rock
sinking
The earth’s crust
(outside bit)

6. 
Also as it sinks more and more weight is put
on the rock.
Sedimentary rock
sinking
The earth’s crust
(outside bit)

7. 

Also as it sinks more and more weight is put
on the rock.
The combination of heat and the weight
changes it from sedimentary to metamorphic
Sedimentary rock
Is now metamorphic
The earth’s crust
(outside bit)

8. 
The way metamorphic rocks are made is
similar to baking a bit of dough with a weight
on top of it
Sedimentary rock
Is now metamorphic
The earth’s crust
(outside bit)

9. 

The way metamorphic rocks are made is
similar to baking a bit of dough with a weight
on top of it
When it comes out of the oven it is flat and
hard.
Sedimentary rock
Is now metamorphic
The earth’s crust
(outside bit)

10. 
Metamorphic rocks are buried so deep it is
weird how they can be found on the surface.

11. 

Metamorphic rocks are buried so deep it is
weird how they can be found on the surface.
When two plates move together they can
create either mountains or volcanoes.
Two Plates moving together

12. 
When the plates create mountains they push
together and the rock moves upwards.
Two Plates moving together
Creating a mountain

13. 

When the plates create mountains they push
together and the rock moves upwards.
The rock from deep in the crust of the plates
is pushed to the surface.
Two Plates moving together
Creating a mountain

14. 
The rock is still buried in the mountain
Two Plates moving together
Creating a mountain

15. 

The rock is still buried in the mountain
But the rock covering the metamorphic rock
is worn away over time
Two Plates moving together
Creating a mountain

16. 


The rock is still buried in the mountain
But the rock covering the metamorphic rock
is worn away over time
So the metamorphic rock is revealed.
Two Plates moving together
Creating a mountain

17. 
Some examples you need to know.

18. 

Some examples you need to know.
The first one is called Marble

19. 


Some examples you need to know.
The first one is called Marble
Marble is made from limestone

20. 



Some examples you need to know.
The first one is called Marble
Marble is made from limestone
Marble is used to make statues.

21. 


The second is called Slate
Slate is thin and very flat
Slate is used for benches, tables, and for
roofing tiles

22. 





The second is called Slate
Slate is thin and very flat
Slate is used for benches, tables, and for
roofing tiles
The Last is Pounamu (Greenstone)
It is only found in New Zealand
It was used as axes and tools by the Moari

23. 
So Metamorphic rock is made from heat and
the weight (pressure) of the rock above it.

24. 

So Metamorphic rock is made from heat and
the weight (pressure) of the rock above it.
It is made deep in the earths crust.

25. 


So Metamorphic rock is made from heat and
the weight (pressure) of the rock above it.
It is made deep in the earths crust.
It can be found on the surface because of
mountain building and those mountions
being worn down

26. 



So Metamorphic rock is made from heat and
the weight (pressure) of the rock above it.
It is made deep in the earths crust.
It can be found on the surface because of
mountain building and those mountains
being worn down
Three examples are Slate, Marble and
Greenstone