3. reasons for climate change and ice ages

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A resource to help teach/study AQA's Cold environments unit - from http://www.coolgeography.co.uk

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3. reasons for climate change and ice ages

  1. 1. Reasons for Climate change and Ice Ages<br />
  2. 2. Some definitions<br />An interglacialis a geological interval of warmer global average temperature that separates glacial periods within an ice age.<br />A glacial is a period of colder temperatures when ice thickens and advances<br />A stadial is a period of colder temperatures during an interglacial, of insufficient duration or intensity to be considered a glaciation, or glacial period. <br />An interstadial is a warmer period during a glaciation of insufficient duration or intensity to be considered an interglacial. Generally, interstadials endure for less than ten thousand years, interglacials for more than ten thousand.<br />“There’s only one Inter in Milan!”<br />
  3. 3. This is the patterns of Glacials and interglacials;<br />
  4. 4. There are 5 possible reasons given<br />Changes in the earth’s position in space, its orbit and tilt<br />Variations in sunspot activity, changing the amount of solar radiation received by the Earth<br />Changes in the amount of volcanic dust affecting the amount of radiation reflected and trapped by the atmosphere<br />Trapping of CO2 by the oceans <br />Variations in ocean currents<br />Choose one of these to research in a pair. You will have 2-3 minutes at the end of the lesson to;<br /><ul><li>Explain how the theory works in relation to climate change
  5. 5. Discuss the evidence that exists to support the theory
  6. 6. Justify your opinion on the theory</li></li></ul><li>Mini presentations<br />
  7. 7. Opinion line; do you strongly agree with or strongly disagree with...<br />Changes in the earth’s position in space, its orbit and tilt<br />Variations in sunspot activity, changing the amount of solar radiation received by the Earth<br />Changes in the amount of volcanic dust affecting the amount of radiation reflected and trapped by the atmosphere<br />Trapping of CO2 by the oceans <br />Variations in ocean currents<br />
  8. 8. What have we discovered this lesson?<br />

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