Global Geographical issues

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  • Created by: Dav K
  • Created on: 16-03-18 16:38

Global Geographical Issues - Hazardous Earth

GLOBAL CIRCULATION

  • Atmosphere transferes heat around the earth - Global Circulation
  • High rainfall - Low pressure
  • Arid areas - High pressure
  • Earth gets energy from the sun
  • Enormous circle of air - Circulation Cell
  • Hot air rises, then cools and sinks
  • Warm air rises - Low pressure

Ocean Currents

  • Transferes heat around the globe
  • Powered by:

              * Wind from circulation cells

              * Density differences from water temperatures

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Global Geographical Issues - Hazardous Earth

NATURAL CLIMATE CHANGE

Natural Causes

  • Earths orbit changes once every 100000 years - Milankovitch Cycles
  • Energy radiated from sun changes over an 11 year cycle
  • Volcano erruptions pump ash - Causing a cooling effect
  • Large asteriod collisions - Causes cooling as it blocks out sun
  • Ocean current changes - Causes cooling & warming
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