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The internal structure of the earth can be divided into
four main layers:

Inner core
Outer core
Mantel
Crust



The Core
At the centre of the earth is the core, which is split into
an inner core and an outer core.
It is the densest part of the planet, being…

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The lithosphere is divided into lots of slabs called tectonic plates.
The plates are moving due to convection currents in the asthenosphere.
The places where plates meet are called plate boundaries or plate margins.




Convection Currents
1. Radioactive decay of some elements in the mantle and core generate a lot…

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In the 17th century people first noticed that South America and Africa looked like they could
fit together. There were suggestions that the continents might once have been joined
together before moving apart, but most people believed the continents were fixed in place.

In 1912 Alfred Wegner proposed the theory…

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Continental Fit
Some continents, such as the western seaboard or Africa and the
eastern seaboard of South America, seem to fit together if placed
beside each other. This is particularly true if the continental shelves
are taken into account as the true edges of the land masses.



Geological Evidence
Areas…

Page 5

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Palaeomagnetism
In 1948 a survey of the floor of the Atlantic Ocean revealed a continuous ridge running
largely north to south. It proved to be around 1,000 km wide, reaching heights of 2.5 km,
and was composed of volcanic rocks.

This suggested sea-floor spreading was occurring. The evidence for this…

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Naeemah

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Hi, i find these resources excellent. I was wondering if you have anymore on this topic about earthquakes and tsunamis. Additionally, do you also have notes on weather and climate? and Globalisation and Development?

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