1. Rocks and the Rock cycle
Chapter 6 - 1
Rocks and the Rock cycle

2. Rocks Material that makes up the solid part of Earth
Collection of one or more minerals
Can be solid organic matter

7. Rock Types
Igneous
Latin – “from fire”
Formed from magma or lava

9. Rock Types
Sediment – rock, mineral, or organic matter broken into pieces
Sedimentary – rock pieces are cemented together

13. Rock Types Metamorphic – “changed form”
Rock formed from existing rock due to heat or pressure

15. Rock Cycle All 3 forms can turn into another
Much of Earth’s rock has been through the cycle
Recycled

17. Bowen’s Reaction Series
Canadian geologist
How minerals crystallize in magma
Different minerals form at different times during solidification
Same order each time

18. Bowen’s reaction series

19. Chemical Stability of Minerals
Measure of the tendency of a chemical compound to maintain it original composition
Instead of breaking down to form another chemical
Determined by strength of bonds

20. Physical Stability of Rocks
Rocks have weak areas that are determined when they form
Joints – weak areas in igneous rocks
Forms when rock cools and contracts

21. Physical Stability Uplifted rocks under pressure tend to break
Decrease in pressure allows joints and fractures to open