Apollo 17 astronauts captured this snapshot of the Earth system on their way to the moon in 1972. Essentially everything that was a part of the system then is still a part of the system today—that's why it's considered a closed system. All of the matter (solid, liquid, and gas) and all of the processes that move energy and materials from one part of the planet to another make up the Earth system.
1. Looking at the image, what are the major parts of our planet that can interact as a system?