Overview

AB PAT Grade 9 K&E Science

Biological Diversity

3. Ecosystems and Interdependence

3.4 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

Students identify key processes driving carbon, nitrogen, and water cycles.

Learners distinguish how matter cycles differ from one-directional energy flow.

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

1 Video lesson

Practice exercises

Learning resources

Skills

Carbon Cycle

Nitrogen Fixation

Decomposition

Water Cycle

Matter Cycling

PROVINCE-TESTS Curriculum Aligned