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The Rock Cycle
Transcript of The Rock Cycle
What are they
made of ?
Grains of Minerals that fit together
Some Rocks Have Interlocking Grains (Granite)
Some Rocks Have Rounded Gains (Sandstone)
Are 3 Types of Rock
Rocks Can Absorb Water?!
Some can! These are known as being
They are more likely to be made of "rounded" grains where the water can seep through them.
Imagine the rock being made of sand and water being able to flow through the tiny gaps.
Contain Rounded Rocks in Layers
How is Sedimentary Rock Formed
Occurs in 3 stages:-
Rivers wash tiny broken pieces of rock to the sea and deposits them in layers.
The weight of all the sediment begins to squash the lower layers
Water is squeezed out leaving salt crystals which cements the sediment together
Inside the earth it can be hot enough to melt rocks; the molten rock is called magma and when this cools becomes a type of igneous rock
The 2 Types!
Igneous Rocks form crystals.
The slower the rate of cooling, the larger the crystals will be!
Being fired out of a volcano would be like someone ripping the duvet off you on a cold morning!
You would get cold very quickly.
These crystals form very quickly and are small
Are able to cool down nice and slowly forming large crystals.
This is because they cool underground
Mineral rich water (due to magma) was able to cool down slowly over 500,000 years at over 50 degrees celcius. Mexico - Cave of Crystal Giants
Are formed from other rocks that are changed due to head and pressure
Movements in the earth can cause rocks (igneous and sediementary) to be buried.
As a result the rocks are heated and put under pressure (do NOT melt).
Because of this the minerals are actually changed chemically!
We can find fossils in rocks!
Most Commonly Found in Sedimentary
This is because animals and plants can be easily trapped between the layers
You can also find fossils in Metamorphic Rocks, however these are often twisted
Process of gradually wearing away of rocks.
There are 3 different types
3 Main types of physical weathering:-
Heat expands the rock.
As it cools the rock contracts
Repeated action causes the rock to weaken and cracks to form.
Wind can blow grains of sand against rocks
The hydraulic action from waves and rain can weather rocks.
An exam favourite
Water gets into a crack in the rock.
Works on the principle that
As the temperature drops the water freezes and expands putting pressure on the rock.
This occurs repeatedly, with the water melting only to be re-frozen each time putting more pressure on the rock until it cracks.
Weathering done by animals or plants
Tree roots can grow through rocks and weaken them.
Some animals can burrow under rocks, and they break under their own weight
Unsurprisingly done by chemicals
Usually consider rain/acid rain.
Rain is naturally acidic due to carbon dioxide, however with air pollution there is more carbon dioxide in the air causing rain to become more acidic.
Carbonate rocks like limestone are highly susceptible and undergo a servere chemical reaction. Rocks like Granite are less effected.