UNIT A:
- connection --- logical relationship, being related or linked
- system --- a group of parts that interact to perform a function
- interaction --- an influence, one part affects another
- input --- anything put in or taken in
- output --- anything given off or taken out
- subsystem --- a smaller system inside a larger system
- function --- purpose or goal
- boundary --- limit or edge of something
- Earth systems
- Biosphere
- Lithosphere - Geosphere
- Hydrosphere
- Atmosphere
- Cryosphere
- Anthrosphere
- Cosmosphere