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7th Grade Science
Ecosystems
15. Human Impact
15.1 Environmental Change, Ecosystem alterations
How Human Activities Alter Ecosystems and Drive Environmental Change
Explore the powerful ways human actions from deforestation to pollution reshape ecosystems, reduce biodiversity, and trigger cascading effects throughout the natural world.
What You'll Learn
Human activities like deforestation and pollution disrupt entire ecosystem structures.
Keystone species removal triggers trophic cascades affecting all food web levels.
Eutrophication from fertilizer runoff creates oxygen-depleted dead zones in water.
Sustainability and conservation strategies help protect biodiversity for future generations.
What You'll Practice
1
Students identify causes and effects of major human ecosystem disturbances.
2
Learners analyze keystone species roles and trophic cascade chain reactions.
3
Practice questions test vocabulary including eutrophication, biomagnification, and biodiversity.
Why This Matters
Understanding how human activities alter ecosystems equips students with the scientific knowledge needed to evaluate environmental challenges and contribute to sustainable solutions in the real world.
This Unit Includes
Practice exercises
Learning resources
Skills
Deforestation
Eutrophication
Invasive Species
Biodiversity
Trophic Cascades
CA Curriculum Aligned