1. Notes-The Rock Cycle

2. Rocks are Made of Minerals
Rock- a naturally formed solid usually made up of one or more minerals.

3. Rocks are Made of Minerals
Rocks are NOT minerals.
The amount of the various minerals in a particular kind of rock can change.

4. Rocks are Made of Minerals
The minerals in a rock are sometimes jumbled together with no crystal structure.

5. Rocks are Made of Minerals
Some rocks are made of only one mineral.
Example: Limestone can be made of pure Calcite.

6. Rocks are Made of Minerals
Some rocks are made of no minerals at all.
Example: Obsidian

7. The Rock Cycle Rocks change over thousands or millions of years.
Rock cycle-the set of natural processes that form, change, break down, and re-form rocks.

8. Rocks do not go through the rock cycle in any particular order.
The rock cycle has no beginning or ending-it goes on and on and on.

9. The 3 types of rock are classified by how they form.

10. Igneous rock forms when molten rock cools and becomes solid.

11. Igneous rock can form inside Earth or on Earth’s surface.

12. Sedimentary rock is formed when sediment gets pressed together.
Sediment: tiny pieces of older rocks, plants, and other loose material

13. Sediment forms when rocks are weathered.
Sedimentary
Sediment forms when rocks are weathered.

14. Sedimentary
The sediment is carried by water or wind and settles into layers that are pressed down over time into rock.

15. Metamorphic
Metamorphic rock forms when heat or pressure causes older rocks to change into new rocks.

16. Metamorphic
The changes in heat and pressure cause the structure of the rock to change and new minerals to form.

17. Rocks in the Crust
Igneous, sedimentary, and metamorphic rocks are all found in Earth’s crust.

18. Sedimentary rock makes up only 5% of the crust.
Rocks in the Crust
Most of Earth’s crust (95%) consists of igneous rock and metamorphic rock.
Sedimentary rock makes up only 5% of the crust.

19. Rocks in the Crust
However, sedimentary rocks are the most common type found on the surface. Why?

20. Rocks in the Crust
Because they are formed by weathering and erosion, which occur on the surface.

21. The 3 groups of rock are sedimentary, metamorphic, and Limestone
Review
The 3 groups of rock are sedimentary, metamorphic, and
Limestone
Granite
Igneous
Coal

22. 2. The rock cycle shows how rocks continually Increase in size
Review
2. The rock cycle shows how rocks continually
Increase in size
Increase in number
Become more complex
Change over time

23. 3. What kind of rock forms when molten rock cools? Metamorphic
Review
3. What kind of rock forms when molten rock cools?
Metamorphic
Sedimentary
Igneous
Extrusive

24. Review
4. An existing rock can change into another type of rock when it is subjected to great
Pressure
Winds
Flooding
Foliation