Matter cycling

5. Large marsupial
6. the relatively thin envelope of gases that forms Earth's outermost layer.
10. the frozen component of the hydrosphere, made up of all the ice and snow on land, plus sea and lake ice.
11. all of Earth's water, including water that cycles through the atmosphere.
12. includes the solid metal inner core, the liquid metal outer core, and the rocky mantle and crust.
13. Flying mammal

1. involves a loop in which a signal or action triggers another signal or action.
2. Man's best friend
3. the parts of Earth that collectively contain all living organisms.
4. Likes to chase mice
7. a group of parts that work together as a whole.
8. Has a trunk
9. the ability to do work.