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9th Grade Science
Matter Cycles
15. Biogeochemical
15.3 Nitrogen Cycle, Nutrient cycling
The Nitrogen Cycle: How Nature Recycles Its Most Essential Nutrient
Discover how nitrogen moves through the atmosphere, soil, and living organisms through a series of remarkable bacterial transformations that sustain all life on Earth.
What You'll Learn
Nitrogen fixation converts atmospheric nitrogen into usable ammonia for organisms.
Nitrification transforms ammonium into nitrates that plants readily absorb.
Ammonification and denitrification return nitrogen compounds back to ecosystems.
Human activities disrupt nitrogen cycling, causing eutrophication and environmental damage.
What You'll Practice
1
Students identify key nitrogen cycle processes including fixation and denitrification.
2
Learners distinguish between ammonification, nitrification, and assimilation in ecosystems.
3
Practice questions test knowledge of rhizobium, nitrates, and decomposer roles.
Why This Matters
Understanding the nitrogen cycle is essential for explaining how ecosystems maintain fertility, how human activities disrupt natural nutrient flows, and how sustainable practices can restore environmental balance.
This Unit Includes
Practice exercises
Learning resources
Skills
Nitrogen Fixation
Denitrification
Nitrification
Ammonification
Nutrient Cycling
MA Curriculum Aligned