Earth Systems

2. a group of parts that work together
5. the solid part of Earth
7. to try something again using what you learned the last time you tried it
9. matter that is made of only one kind of atom or molecule
11. a description of how something works or why something happens
13. all the living things on Earth
14. all of the liquid water and ice on Earth
16. a person who uses science knowledge to design something in order to solve a problem
19. when a liquaid turns into a gas
20. to try to make something new that solves a problem

1. that has been used and now contains harmful substances
3. reaction/ a process in which substances change into different substances
4. a group of atoms joined together in a particular way
6. the air that surrounds Earth
8. vapor/ water in the form of invisible gas
10. a supply of something that is useful
12. what you can observe or measure about something that helps you figure out what it is
15. the stuff that things are made of
17. to put together multiple pieces of information in order to understand something
18. when a gas turns into a liquid