1. Igneous Rocks

2. States that in a series of rock layers, the layers toward the bottom had to be laid first and were therefore older than layers higher up.

3. What is? Principle of superposition

4. Because they believed that simple fossils came before complex & Because they believed that simple fossils came before complex & Rocks containing similar fossils must have similar ages even if they are horizontally far apart Rocks containing similar fossils must have similar ages even if they are horizontally far apart Linked fossils together in a “guide fossil” Linked fossils together in a “guide fossil”

5. What are Index fossils

6. This is molten rock found beneath the surface of the earth.

7. What is Magma

8. This is molten rock found above the earth’s surface.

9. What is Lava

10. This rock forms when molten rock solidifies above the earth’s surface.

11. What is Extrusive Rocks

12. This is formed when molten rock solidifies after squeezing into other rocks or intruding into them

13. What is Intrusive Rocks

14. Intrusive rocks can eventually appear at the earth’s surface because

15. What is Erosion

16. Magma that intrudes into cracks that cut through existing layers of rock hardens to form what?

17. What is dikes

18. This rock is similar to scoria but is a light- colored rock. It often contains so many trapped bubbles that it can float in water.

19. What is Pumice

20. This “natural glass” made of lava cools rapidly and has no crystals. It occurs in the colors black, brown, and red and it fractures conchoidally

21. What is Obsidian