1. Warm up How are igneous rocks formed?
What is the difference between extrusive and intrusive igneous rocks?
What are barrier islands?

2. Characteristics of Soil
Physical and Chemical weathering creates rock fragments called Regolith.
Soil is the part of the regolith that supports life.

3. Soil Profile = all the layers that make up the soil in an area
• Soil forms in layers called horizons
• Mature soil has at least three horizons: A (topsoil), B (subsoil), and C (weathered bedrock).

4. Soil Composition
Soil has four major components:
Mineral matter (broken down rock) (45%)
Organic matter, called humus (5%)
Water (25%)
Air (25%)

5. Why is the term “lunar soil” a misnomer (a poorly chosen name)?
Think about it for 30 seconds and then talk to your table or partner for 60 seconds.

6. 5 Factors that are most important in the formation of soil are:
Soil Formation
5 Factors that are most important in the formation of soil are:
Parent Material
The source of mineral matter in soil.
The more time it has to form the thicker it will be.
TIME

7. AND
Differences in temperature and precipitation influence rate, depth, and type of weathering on the soil.
climate
temperature
precipitation
&
a cold, dry climate might produce mechanically weathered soil
a hot, wet climate may produce chemically weathered soil

8. Plants -are the main source of organic matter in soil
Organisms Help by-
Plants -are the main source of organic matter in soil
Microorganisms -play a role in decomposing organic matter (dead plants and animals)
Burrowing animals -mix the mineral and organic matter

9. Soil Textural Triangle
The percentage of sand, silt and clay will tell you the texture name  
Example:
30% clay
10% sand
60% silt
…….is Silt Clay Loam

12. Bill Nye

13. Snowball Fight Create a test review question
Write it on a piece of paper
Ball up the paper into a snowball
When Mr. Hundley says “Go,” FIGHT!

14. Review Day – Build Your Own Test!
On one sheet of paper
Build your own Unit 3 test!
It must be AT LEAST 20 questions long.
Questions can be short answer, multiple choice, diagram drawing, or true/false.
BE NEAT! Someone will have to take this.
On another sheet of paper
Write out the answer key to your test.
Make sure you answer EVERY QUESTION correctly and neatly – this means drawing diagrams or answering short answer questions if you asked them.

15. Review Day – Build Your Own Test!
Step 1: Do your best to take another student’s test!
Step 2: When Mr. Hundley says so, go find that person to use the answer key to grade the test you just took.
Step 3: What holes in your knowledge did you find? What do you REALLY need to study before the test tomorrow?

16. Warm up
How many soil horizons are in mature soil?
What is the technical term for a layer of weathered rock?
What are the four components of soil?
Riddle: What starts with "e" ends with "e" and contains only one letter?

17. Unit 3 Test! Make a “Share Sheet” for the test
Rocks/Rock Cycle
Weathering (Mechanical/Chemical/Rates)
Soil
Everyone must make a share sheet
I will choose ONE of your table’s sheets that you will be able to use

18. Soil Extra Credit