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How do ecosystems change
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How do ecosystems change

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How do ecosystems change How do ecosystems change Presentation Transcript

  • How doecosystems change?Grade 3
  • Waysecosystemschange :
  • Volcanoes
  • Fires
  • Floods
  • ways animalschangeecosystems:
  • 1.locusts1. locusts
  • 2. beavers builddams
  • 3. earthworms dig holesin soil- bring oxygen toplant roots
  • wayspeoplechangeecosystems:
  • 1. build houses
  • 2. clear forests
  • 3. introduce new plants &animals(accidentally or on purpose)
  • 4. throw out garbage
  • 4. Air pollution