Chapter 19: Cycles in Nature

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Chapter 19 Cycles in Nature

• Ms. Epps and Ms. Arrington
• AC Science 7th grade

http//www.youtube.com/watch?vfm5RvtLD0xI
http//www.youtube.com/watch?vP_ru5UnrUTs
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Nitrogen Cycle!!

• Organisms need nitrogen to build proteins and DNA
  for new cells.
• This cycle is the movement between the
  environment and living things.
• 78 of the Earths atmosphere is nitrogen gas
  HOLY COW!
• Most organisms cant use nitrogen gas DIRECTLY so
  the bacteria in the soil converts it into forms
  that plants can use Nitrogen Fixation
• When organisms die, decomposers break down the
  remains, which releases a form of nitrogen

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Virtual Investigation!!
Go to the link below. Answer the questions on
your lab sheet.
http//www.pbslearningmedia.org/content/lsps07.sci
.life.eco.nitrogen/