Human Systems
Natural Systems System – Group of parts working together to complete a function Nature is a system and contains many subsystems. These systems are all interrelated Changes in one of these systems will impact the other systems, and it is possible and necessary to be able to predict how a change to one system will affect another system
Natural Systems Closed Systems – a system where nothing enters or leaves – it is self-contained Open Systems – a system that requires resources to enter the system or waste to leave the system Input – something going into a system Output – something leaving a system
The Earth, in terms of matter, is a closed system
Natural Systems Humans clearly disrupt biogeochemical cycles In the absence of humans, are the biogeochemical cycles stable? Change is a part of natural biogeochemical cycles
Investigating Cycles Use the information provided to answer Earth’s major cycles the following questions: include the following: 1. What elements are involved in each • Water cycle • Carbon Which of Earth’s spheres are 2. • Nitrogen involved in each cycle • 3. Name three important needs for each Phosphorus element/compound 4. What ultimately powers these cycles 5. In what sphere is each of the elements most common 6. What happens to nutrients when living things die
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