Thursday, 2 May 2013


Year 8 - Volcanoes 

Recommended Links

Volcanoes Around the World 

- some annotated maps by Year 8.

 Well done!

The Structure of the Earth

We found out about the layers below the Earth's surface:
      • The Crust
      • The Mantle
      • The Inner Core
      • Outer Core

New Discoveries

New research suggests that the Inner Core consists of iron alloy crystals.
They could be up to 10km high - like a crystal forest at the centre of the Earth.
(source: BBC Horizon: The Core)

The BBC reported :

Earth's core far hotter than thought

'New measurements suggest the Earth's inner core is far hotter than prior experiments suggested, putting it at 6,000C - as hot as the Sun's surface.' This means that the pressure at the earth's core is 1 million times that of the ocean floor.

So the science of plate tectonics is continuously making new discoveries.

Continental Drift

In 1915 Alfred Wegner, a German geologist, proposed the theory of Continental Drift in his book 'On the Origin of Continents and Oceans' and since then scientists have researched the movements and make up of our planet.

The Plates that make up our Planet.

Plates meet at plate boundaries where they either collide or move apart from each other.

There are 4 main types of plate boundaries.
  1. Constructive or divergent
  2. Destructive or convergent
  3. Collision
  4. Conservative or transform
We will be concerned with Constructive and Destructive plate boundaries and hot spots as this is where  most volcanic activity occurs.

Earthquake Anatomy

From Visually.

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