Grade 12 Science Worksheets
Earth runs on interlocking systems fine-tuned over billions of years. Understanding them is the first step to protecting them, and yourself.
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What your child will learn: Environmental Science: Earth's Systems & Our Future
- Earth's spheres interact: atmosphere (air), hydrosphere (water), geosphere (rock/soil), biosphere (life). A volcano touches all four!
- The carbon cycle: plants absorb CO₂; animals and burning release it. Burning fossil fuels adds ancient carbon fast, strengthening the greenhouse effect and warming the climate.
- The water cycle (evaporation → condensation → precipitation) and nutrient cycles recycle Earth's fixed resources endlessly.
- Sustainability means meeting today's needs without wrecking tomorrow's: renewable energy (solar, wind, hydro), conservation, and biodiversity protection all buy the future time.
Sample worksheet questions
1. Define sustainability.
Answer: Meeting present needs without compromising future generations' ability to meet theirs
2. Name the three steps of the water cycle.
Answer: Evaporation, condensation, precipitation
3. Which sphere contains all living things?
Answer: The biosphere
4. Why does burning fossil fuels change the climate?
Answer: It rapidly releases ancient stored carbon as CO₂, intensifying the greenhouse effect
5. Name Earth's four spheres and what each contains.
Answer: Atmosphere (air), hydrosphere (water), geosphere (rock/soil), biosphere (living things)
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Try it at home
🏠 Home Energy Audit: Walk your home and list 5 concrete changes that would cut energy or water use. Estimate which single change saves the most, and pitch it to your family.
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