Post on 22-May-2015
description
transcript
Types of Rocks - Metamorphic
All you need to know
Metamorphic rocks are rocks that are changed by heat and pressure.
How they are made
Metamorphic rocks are rocks that are changed by heat and pressure.
They are made deep in the earths crust.
How they are made
The earth’s crust(outside bit)
Metamorphic rock Being made close to the Next layer of the earth
A layer of sedimentary rock slowly sinks closer and closer to the centre of the earth
How they are made
The earth’s crust(outside bit)
Sedimentary rock sinking
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.
How they are made
The earth’s crust(outside bit)
Sedimentary rock sinking
Also as it sinks more and more weight is put on the rock.
How they are made
The earth’s crust(outside bit)
Sedimentary rock sinking
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
How they are made
The earth’s crust(outside bit)
Sedimentary rock Is now metamorphic
The way metamorphic rocks are made is similar to baking a bit of dough with a weight on top of it
How they are made
The earth’s crust(outside bit)
Sedimentary rock Is now metamorphic
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.
How they are made
The earth’s crust(outside bit)
Sedimentary rock Is now metamorphic
Metamorphic rocks are buried so deep it is weird how they can be found on the surface.
How they get to the Surface
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.
How they get to the Surface
Two Plates moving together
When the plates create mountains they push together and the rock moves upwards.
How they get to the Surface
Two Plates moving togetherCreating a mountain
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.
How they get to the Surface
Two Plates moving togetherCreating a mountain
The rock is still buried in the mountain
How they get to the Surface
Two Plates moving togetherCreating a mountain
The rock is still buried in the mountain But the rock covering the metamorphic rock
is worn away over time
How they get to the Surface
Two Plates moving togetherCreating a mountain
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.
How they get to the Surface
Two Plates moving togetherCreating a mountain
Some examples you need to know.
Examples
Some examples you need to know. The first one is called Marble
Examples
Some examples you need to know. The first one is called Marble Marble is made from limestone
Examples
Some examples you need to know. The first one is called Marble Marble is made from limestone Marble is used to make statues.
Examples
The second is called Slate Slate is thin and very flat Slate is used for benches, tables, and for
roofing tiles
Examples
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
Examples
So Metamorphic rock is made from heat and the weight (pressure) of the rock above it.
Summary
So Metamorphic rock is made from heat and the weight (pressure) of the rock above it.
It is made deep in the earths crust.
Summary
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
Summary
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
Summary