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Geography
By Bethany Parkinson 9MT
A rock is a compact mass of mineral matter.
There are three main type's of rocks!
• Igneous
• Metamorphic
• Sedimentary
Igneous rocks are formed from Volcanoes.
They are formed underground by the trapped,
cooled magma.
They are also formed above the ground when
the volcanoes erupts and the magma cools.
Examples of igneous rocks:
Examples of igneous rocks are basalt,
granite, scona ,pumice and obsidan.
Pumice
Basalt
The most common igneous rocks are
granite and basalt.
Granite is used for kitchen worktops and
fire surrounds.
Sedimentary Rocks are formed under
water.
They are made up of layers of bits of
eroded earth in lakes.
These layers form into rocks over a period
of time.
Types of Sedimentary Rocks:
Some examples of sedimentary rocks are
shale, Sandstone ,Gypsum, Limestone,
Coul and Conglome rale.
Limestone
Sandstone
Uses for Sedimentary Rocks:
• Sedimentary rocks such as
sand stone are often used
by builders for decoration on window
surrounds and windowsills.
• Coal is the most common sedimentary
rock and is used to burn for heat.
• Metamorphic rocks are rocks that have
been changed by heat and pressure.
• Metamorphic rocks were once igneous or
sedimentary but have been changed.
Schist and Gnesis are both types of
metamorphic rocks.
Gnesis
Schist
Uses for Metamorphic Rocks:
• Marble which is a metamorphic rock is
used for wall and floor tiles.
It is also used for fireplaces.
• Slate is another metamorphic rock which
is used for roofs on buildings.
• Metamorphic rocks are tough
and resistant.
• Weathering is when the rocks are broken
down by different types of weather.
• Freeze thaw weathering is when water
gets into the crack of the rocks and it
freezes. Repeated freezing and thawing
weakens the rock and splits it into pieces.
• Weathering is most common in
mountainous areas.
• Erosion is the breakdown of the rocks
through their contact with water, ice, heat
or anything which rubs against the rocks.
• Erosion changes the shapes of the rocks
and their texture.
Message from Mr Manson
• A simple but very effective design for your
work Bethany
• I love the way that you have broken each
rock type into 3 sections and explained
each part individually.
• Some really good work and presentation –
well done
• A1