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Grade 7
Ecosystems
14. Energy Flow
14.2 Matter Cycles, Biogeochemical cycles
Matter Cycles & Biogeochemical Cycles: How Earth Recycles Carbon, Nitrogen, and Water
Discover how essential elements like carbon, nitrogen, water, and phosphorus cycle continuously through living organisms and the nonliving environment to sustain all life on Earth.
What You'll Learn
Matter cycles continuously between living organisms and nonliving environments always.
Carbon, nitrogen, water, and phosphorus each follow distinct cycling pathways.
Decomposers recycle nutrients while energy flows only in one direction.
Human activities like burning fossil fuels disrupt natural biogeochemical cycles significantly.
What You'll Practice
1
Students identify key processes driving carbon, nitrogen, and water cycles.
2
Learners distinguish how matter cycles differ from one-directional energy flow.
3
Practice questions explore how human activities disrupt natural biogeochemical cycles.
Why This Matters
Understanding biogeochemical cycles is essential because it explains how Earth sustains all life by continuously recycling matter through living and nonliving systems, and how human activities can disrupt these critical natural processes.
This Unit Includes
Practice exercises
Learning resources
Skills
Carbon Cycle
Nitrogen Fixation
Decomposition
Water Cycle
Matter Cycling
NS Curriculum Aligned