1. The rock cycle shows how rocks change
3.1 Notes
The rock cycle shows how rocks change

2. Most Rocks are Made of Minerals
Just as the pieces of a jigsaw puzzle combine to form the picture, minerals combine to form most rocks.

3. Most Rocks are Made of Minerals
Just as letters combine to form words, minerals combine to make rocks.

4. Most Rocks are Made of Minerals
A rock is a naturally formed solid that is usually made up of one or more types of minerals.

5. Most Rocks are Made of Minerals
The proportion of different elements in a particular kind of rock may change.

6. Most Rocks are Made of Minerals
The minerals in a rock can be jumbled together with no crystal structure.

7. Most Rocks are Made of Minerals
A few rocks are made up of only one mineral.
Example: Limestone can be made up of pure Calcite.

8. Most Rocks are Made of Minerals
A few rocks are made up of no minerals.
Example: Obsidian

9. Our World is Built of Rocks
Beneath the surface, Earth is made of solid and molten rock.

10. Our World is Built of Rocks
People use rocks for many purposes, including…

11. Our World is Built of Rocks
The building of houses and skyscrapers

12. Our World is Built of Rocks
Sources of metal like iron and copper.

13. Our World is Built of Rocks
The carving of statues and other works of art.

14. Our World is Built of Rocks
As a base for pavement for roads and highways

15. Our World is Built of Rocks
People study rocks to learn how areas have changed through time.

16. Rocks Change as They Move Through the Rock Cycle
Rocks change over thousands to millions of years.
The rock cycle is the set of natural processes that form, change, break down, and re-form rocks.

17. Rocks Change as they Move Through the Rock Cycle
Rocks do not move through the rock cycle in a particular order.
The rock cycle has no beginning or ending but goes on continually.

18. The 3 types of rock are classified by how they form.
Rock Types
The 3 types of rock are classified by how they form.

19. Igneous rock forms when molten rock cools and becomes solid.
Rock Types
Igneous rock forms when molten rock cools and becomes solid.

20. Igneous rock can form within Earth, or it can form on Earth’s surface.
Rock Types
Igneous rock can form within Earth, or it can form on Earth’s surface.

21. Rock Types
Sedimentary rocks is formed when pieces of older rocks, plants, and other loose material get pressed or cemented together.

22. Rock Types
Loose material is carried by water or wind and then settles out, forming layers that are pressed down into rock.

23. Rock Types
Metamorphic rock forms when heat or pressure causes older rocks to change into new types of rocks.

24. Rock Types
The changes in heat and pressure cause the structure of the rock to change and new minerals to form.

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

26. 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.

27. Rocks in the Crust
Sedimentary rocks are the most common type found at the surface because they are formed by processes that occur at the surface.

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

29. 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

30. 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

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