GEOG-120 Lecture Notes - Lecture 20: Hydrosphere, Cryosphere, Geosphere
System is a network of relationships among parts, elements, or components that interact with and in uence one another through the exchange of energy, matter, or information. Systems that receive inputs of both energy and matter and produce outputs of both are called open systems. Closed systems are systems that receive inputs and produce outputs of energy, but not matter. Feedback loop is known when sometimes a system"s output can serve as input to that same system. Negative feedback loop, output that results from a system moving in one direction acts as input that moves the system in the other direction; stabilizes (thermostat) Positive feedback loop has the opposite effect; rather than stabilizing a system, they drive it further toward one extreme or another (erosion) Homeostasis is the tendency of a system to maintain constant or stable internal conditions. Resilience how readily is will return back to normal. Emergent properties characteristics not evident in the components alone.