Edexcel B Unit 1 :Dynamic Planet (Topic 1 Restless Earth Revision Guide Power Points)

These are the revision powerpoints that I did for my revision notes, and I am putting them up as they are everything you need to know for the dynamic planet exam this monday. This powerpoint is just for the first topic which is restless earth and so yeah i will be putting up the other powerpoints soon :)

BTW these powerpoints are copy right me but all the images like belong to different people and i am just going to say that they are copy right google images as i dont know where each one is individually from so whatever. carry on stop wasting time reading the description and GET REVISING!! ----->

Comment and Rate 5 Stars ;)

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  • Created by: S Satish
  • Created on: 08-06-10 22:04
Preview of Edexcel B Unit 1 :Dynamic Planet (Topic 1 Restless Earth Revision Guide Power Points)

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Topic 1
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The earth's
structure is the
inner core then
the outer core
then the mantle
and then the
asthenosphere
and the crust
(oceanic and
continental)
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The inner core is made out of solid
nickel and iron because of the high
pressures at the centre of the Earth. It
is very dense and hot at the core
(approx 5500 degrees). People think
when the Earth was formed all the
dense substances sank to the middle of
the Earth. The outer core is made out
of liquid iron and nickel. The mantle is
made up of the asthenosphere and the
lower mantle and the mantle is made
from peridotite. The lower mantle is
solid however the Asthenosphere is at
a molten state. The lithosphere is made
up of the crust and the upper most
mantle. Crust can be split into two
categories; the continental crust (is
crust that is land and is made of
granite) and the oceanic crust (crust
that is land under oceans which is
mad of basalt).
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Continental Crust is less
dense than Oceanic crust
and it is made out of
granite and it is crust on
land.
Oceanic Crust is more
dense than Continental
crust and is made out of
basalt and it is crust under
the oceans/seas etc.
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The radioactive decay of unstable
elements such as uranium and
thorium in the core and mantle
cause geothermal heat (heat
produced within the Earth) and
so this causes convection
currents in the Mantle as well as
the Liquid Outer Core. These
convection currents are strong
enough to make the tectonic
plates move.
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