8th Grade Final Crossword

1. Vertical distance between a wave's crest and trough is its.
3. Published the idea that organisms could change over time to adapt to their environments to survive to reproduce.
7. Valuable topsoil containing equal parts sand and silt with about half as much clay.
10. Scientific information collected with an instrument.
11. Two or more substances physically combined, not chemically bonded
12. A layer of rock that directs groundwater from one place to another.
13. We can observe how the sun rotates on its axis because of the movement of these.
14. A mineral with only one kind of atom
16. The fossil fuel that most scientists agree came from fossilized land plants.
17. Type of fossil created by a fossilized track or burrow made by an animal.
18. This force keeps the planets in their orbits.

2. The gradient of a stream relates most closely to its.
4. Clouds that bring rain.
5. Rocks that contain many cracks or open spaces between their particles.
6. Geology means the study of
8. How mica can be broken into flat sheets.
9. Planets that are similar to the earth in density and size.
11. Has the greatest influence in causing tides.
15. Large, flat regions of the moon’s surface that are made of hardened basaltic lava.