Across
- 6. the number of protons per atom
- 8. exchanges no energy or matter with its surroundings.
- 9. a complex assemblage of animals, plants, and their environment, through which materials and energy move.
- 10. are those that receive inputs from their surroundings and produce outputs that leave the system.
- 13. made of positively charged
Down
- 1. a term we can use to describe the energy and matter that flow into, through, and out of a system.
- 2. circled by negatively charged
- 3. the pathways by which those resources move from one state variable to another.
- 4. electrically neutral
- 5. the sum of the protons and neutrons in each nucleus.
- 7. which are substances that cannot be broken down into simpler forms by ordinary chemical reactions.
- 11. which store resources such as energy, matter, or water.
- 12. a network of interdependent components and processes with materials and energy flowing from one component of the system to another.