- Student instructions
- 1 plastic vial of sand
- 1 plastic vial of limestone
- Simulated “Acid Rain”
- 12 strips of pH paper
- pH color chart
- 1 dropper
- 2 stirrers
$12.95 – $92.95
Why does acid rain decrease the pH of some lakes and not others? Explore the role of different bottom materials in keeping the pH of lakes constant.
HS-LS2-6. Evaluate the claims, evidence, and reasoning that the complex interactions in ecosystems maintain relatively consistent numbers and types of organisms in stable conditions, but changing conditions may result in a new ecosystem.
Developing and Using Models - Use a model, analyze and interpret data
LS2.C: Ecosystem Dynamics, Functioning, and Resilience - If a biological or physical disturbance to an ecosystem occurs, including one induced by human activity, the ecosystem may return to its more or less original state or become a very different ecosystem, depending on the complex set of interactions within the ecosystem.
ESS2.A: Earth's Materials and Systems - Earth’s major systems are the geosphere (solid and molten rock, soil, and sediments), the hydrosphere (water and ice), the atmosphere (air), and the biosphere (living things, including humans). These systems interact in multiple ways to affect Earth’s surface materials and processes. The ocean supports a variety of ecosystems and organisms, shapes landforms, and influences climate. Winds and clouds in the atmosphere interact with the landforms to determine patterns of weather.
Stability and Change - Students understand much of science deals with constructing explanations of how things change and how they remain stable. They quantify and model changes in systems over very short or very long periods of time. They see some changes are irreversible, and negative feedback can stabilize a system, while positive feedback can destabilize it. They recognize systems can be designed for greater or lesser stability.
Systems and System Models - A system can be described in terms of its components and their interactions.