1. Let’s take a closer look.
What Are Rocks?
Let’s take a closer look.

2. Rocks Rocks are a mixture of minerals and other materials.
Basically, rocks are pieces of the crust.
Three types of rock: Igneous, Sedimentary, and Metamorphic

3. Processes of Rock Changes
Weathering
Erosion
Compaction
Cementation
Melting
Cooling (Freezing?)

4. Rock Cycle

5. Igneous Rocks What first comes to mind when I say igneous?
Rock formed from magma or lava when it cools.

6. Igneous Rock Three types of Igneous: Basaltic, Andesitic, Granitic
Formed inside Earth- Intrusive rock
Formed at or above crust- Extrusive rock

8. Sediments Weather- break down of rock.
Spectacular Demonstration of Weather
Erosion carries broken down rock to other locations.

10. Sedimentary Rock
Sediments precipitate out of solutions to form strata.
The sediments are compacted and compressed in a process called lithification.

11. Fossils and Law of Superposition
What is a fossil?
The trace or remains of an organism that lived long ago, most commonly preserved in sedimentary rock
What is the Law of Superposition?
Younger rocks lie above older rocks if the layers have not been disturbed

13. Index Fossils

14. Relative Age Dating and Index Fossils
What is relative age dating?
Determining whether an event or object is older or younger than other events or objects.
What is an index fossil?
A fossil that is used to establish the age of the rock layers.
It is found in the rock layers of only one geologic age.
It is found in rock layers
around the world ex Trilobites

16. Metamorphic Rock
Conversion of rock from one form to another by heat and pressure.
As you decrease in depth 1 km temperature rises 300 C.
Two types of Metamorphic:
Foliated- Stripped or banding (slate, gneiss)
Nonfoliated- plain with no banding (marble)