GRADE 12 SCIENCE · CHAPTER 5
Earth, weather & space
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Earth systems models
Track a simplified environmental stock
Use a stated stock-and-flow model to calculate change while distinguishing model assumptions from real-world forecasts.
AN EXAMPLE FROM THIS CHAPTER
A simplified reservoir contains 100 units. During one year, inputs are 12 and outputs 9 units. What is its ending stock?
Show answer & explanation
103 units
100 + 12 − 9 = 103 units.
Curriculum & source notes
These are original Little Play study books organized around U.S. school topics. The official curriculum references below guide topic scope and progression. Coverage is selected, not a complete curriculum or a verified match to every state standard. They are not copies of a publisher’s textbook. Check your school’s syllabus and book edition.
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