Answers edited by Katie

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• How can igneous rocks be identified?
  
• Question #4332f
  
• Question #88788
  
• Question #7edb6
  
• How do contour lines show hills and depressions?
  
• How do you calculate the number of moles from volume?
  
• What is moulting?
  
• Question #f4c4f
  
• How do you factor #6x^2 + 7x - 20 = 0#?
  
• What is tension and where in the crust is this likely to occur?
  
• What is nitrogen fixation and why is this important?