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Earth Structure Recap.
Use arrows to locate the labels on the left hand side.
400°c
5270 km
2900 km
6370 km depth
5000°c
Inner Core
Mantle
Asthenosphere
3000°c
Outer Core
Lithosphere
Say which is the odd one out and explain why.
Inner Core
Crust
Outer Core
Mantle
Core
Convection
Earthquake
Convection
Volcano
Why are the core and mantle of the Earth so hot and how does this heat affect life on the
surface of the planet?
Key words Radioactive Decay, Convection Currents, Plate tectonics, Earthquakes,
Volcanoes, magnetism.
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Extra info! -
Find out who Lord Kelvin was and what he calculated.
Contrasting Crustal Components
A sample of Granite
A sample of Basalt
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2.9 grams per cm cubed
Cools quickly close to the surface or
as lava erupted from a volcano.
Contains less than 20% Quartz and
large amounts of Magnesium.
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2.6 grams per cm cubed
Cools under ground slowly from magma
allowing large cristals to grow.
Contains mostly Silica with at least 20%
Quartz.
In your exam you may be asked to CONTRAST geographic features or
processes. This means say how they are DIFFERENT.
Exam question (4 marks)
Contrast the two types of the Earths crust.
There are two types of Crust, Oceanic and Continental. Continental crust is
light with a density 2.6 times that of water, it also has a lot of Silicon. Oceanic
crust is called basalt which is a dark rock which has cooled quickly so has
small cristals. It has a high density of 2.9 as it has dense minerals in it.
How many marks would you give the answer above and why?
What words can you use to contrast the two types of crust?
However, on the other hand, alternatively, whereas
Denser, Darker, more slowly, larger cristals
Extension Exam question (8 marks)
Describe two different types of the earths crust and explain what happens when they
collide and why.