© boardworks ltd 20151 of 7. 2 of 7© boardworks ltd 2015 structure of the earth we get many useful...
Post on 05-Jan-2016
238 Views
Preview:
TRANSCRIPT
© Boardworks Ltd 20151 of 7
2 of 7 © Boardworks Ltd 2015
Structure of the Earth
We get many useful substances from rocks, such as building materials, metals and jewels. But where do we get the rocks themselves from?
The Earth’s crust is made out of rocks. The Earth’s crust is the thin outer layer of the Earth. It is about 30 km thick on land and only about 8 km thick under the sea.
crust
mantle
inner core
outer core
3 of 7 © Boardworks Ltd 2015
Cross-section of the Earth
4 of 7 © Boardworks Ltd 2015
What is the Earth’s crust made of?
5 of 7 © Boardworks Ltd 2015
Minerals and metals
Many of the useful substances we get from the Earth’s crust are minerals, which can contain useful metals and other substances.
Here are the names and formulae of some common minerals:
Fe2O3
Al2O3
PbS
TiO2
Cu2S
haematite
bauxite
galena
chalcocite
rutile
mineral formula substance extracted from it
iron
aluminium
lead
titanium
copper
6 of 7 © Boardworks Ltd 2015
Minerals and rocks
Minerals have a set chemical composition.
Rocks do not have a set composition and are often made up of several different minerals and other materials. For example, the rock granite is made up of the minerals quartz, feldspar and biotite.
Minerals are found in the Earth’s crust. Minerals that humans use are usually extracted from mines.
An area that has a lot of a specific mineral is called a deposit.
What is the difference between rocks and minerals?
7 of 7 © Boardworks Ltd 2015
Want to see more?
This is only a sample of one of thousands of
Boardworks Science presentations.
To see more of what Boardworks can offer, order a
full presentation completely free:
www.boardworks.co.uk/sciencepresentation
top related