Earth as a Living System: Presentation

Section role: supports the 'Connecting Systems and Cycles' section while the teacher formalizes concepts, addresses misconceptions, and shows real-world examples of Earth's spheres interacting. Slides: (1) Title – 'Earth's Living Systems: Cycles and Feedback Loops'; (2) Review of Mars Habitat Diagrams – bullets: connections to student work from Section 2, what was successful, what was overlooked; (3) Biogeochemical Cycles Explained – bullets: definition, how substances move through biotic and abiotic compartments, emphasis on carbon and nitrogen as vital examples; (4) Homeostasis at a Planetary Scale – bullets: definition, how Earth maintains equilibrium through natural processes; (5) Feedback Loops in Action – bullets: positive vs. negative feedback, examples like Arctic ice melt (positive) and cloud formation (negative); (6) Biosphere's Impact on Other Spheres – bullets: the Oxygen Revolution (biosphere to atmosphere), soil formation (biosphere to geosphere); (7) Geosphere's Influence on Climate and Life – bullets: volcanic eruptions (geosphere to atmosphere/biosphere), plate tectonics affecting ocean circulation (geosphere to hydrosphere); (8) Global Examples of Interacting Systems – bullets: coral reefs (biosphere, hydrosphere, geosphere), rainforests (biosphere, hydrosphere, atmosphere, geosphere); (9) Why Earth is a 'Living System' – bullets: complex interactions, self-regulation, constant change; Closing slide: 'How do human activities intentionally or unintentionally create new feedback loops within these systems?' – sets up future discussions on environmental impact.

Lara from Teachy