Warm up
1.How are igneous rocks formed?
2.What is the difference between extrusive
and intrusive igneous rocks?
3.What are barrier islands?
Characteristics of Soil
• Physical and Chemical weathering
creates rock fragments called Regolith.
• Soil is the part of the regolith that
supports life.
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).
Soil Composition
• Soil has four major components:
•Mineral matter (broken down rock)
(45%)
•Organic matter, called humus (5%)
•Water (25%)
•Air (25%)
• 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.
Soil Formation
5 Factors that are most important in the
formation of soil are:
The source of mineral
matter in soil.
The more time it has to
form the thicker it will
be.
AN
D
• a hot, wet climate may
produce chemically weathered
soil
Differences in
temperature and
precipitation influence
rate, depth, and type
of weathering on the
soil.
•a cold, dry climate might
produce mechanically
weathered soil
• 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
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
Bill Nye
• https://www.youtube.com/watch?v=jVdSPZLh5s
Snowball Fight
1. Create a test review question
1. Write it on a piece of paper
1. Ball up the paper into a snowball
1. When Mr. Hundley says “Go,” FIGHT!
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.
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?
Warm up
1. How many soil horizons are in mature
soil?
2.What is the technical term for a layer of
weathered rock?
3.What are the four components of soil?
Riddle: What starts with "e" ends with "e"
and contains only one letter?
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
Soil Extra Credit
• http://www.youtube.com/watch?v=Ego6LIIjbY