C1 Our changing planet

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Structure of the Earth

  • The Earth is made of layers called the core, mantle and crust with the atmosphere around the outside.
  • The Earth's limited resources come from its crust, the oceans and the atmosphere.

The restless Earth

  • The Earth's crust and upper mantle is cracked into tectonic plates which are constantly moving.
  • The tectonic plates move because of convection currents in the mantle that are caused by radioactive decay.
  • Earthquakes and volcanoes happen where tectonic plates meet, butit is difficult to predict accurately when and where earthquakes will happen.
  • Wegner's theory of continental drift was not accepted for many years.

The Earth's atmosphere in the past

  • The Earth's early atmosphere was formed by volcanic activity. 
  • It probably consisted mainly


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