1. January 14, 2013 Class : Table of contents: pg 9
Set up DSQs pgs. 16 and 17
Mini Assessment #1
Dendrochronology pg. 21
Tree Cookie Lab pg. 20
HW: Test Friday! Study!

2. What is the difference between weather and climate? Pg. 15
Weather- the atmospheric conditions of a specific (day to day) time period. Climate- the average atmospheric conditions of a region over a longer (30 years) period of time. Weather is wearing a sweater, climate is the amount of sweaters you own. Or Climate is what you expect, weather is what you get.

3. What is proxy data?
This is data that is gathered using a representative sample.
Examples:
Ice cores
Tree Rings
Fossil Pollen
Ocean Sediments
Coral Reef

4. DSQ #1 pg. 16
Question: How do scientists use tree rings to study climate change? (pg 615)
Did you know??????????????
Bole is another name for a tree
trunk!
Dendrochronology is the study of
tree rings?

5. Pg
Pg. 20 : Tree Cookie
Pg. 21: Dendrochronology

6. The annual rings of a tree can give scientists a snapshot of the environment. You might be surprised by how much can be told by looking at the rings of a tree. Scientists have identified:
times of too much water (floods),
times of too little water (drought),
Lightening strikes,
earthquakes,
insect infestations,
climate change.

7. Tree Growth History 1 light-colored ring + 1 dark-colored ring = 1 year. This is called a "growth ring."
Every year that a tree grows its trunk gets fatter. This is because trees don't just grow up they grow out in the form of rings too. The newest growth of a tree is between the bark and the wood that grew the year before.
In parts of the world with four seasons, trees usually grow best in the spring. Some parts of the world only have two seasons, wet and dry. In those areas, trees grow best in the wet season.
Wood that grows in the spring makes a light-colored ring.
In the summer (or dry season) trees don't grow as much. Wood that grows in the summer makes a dark-colored ring.

8. January 15, 2013 Class: Table of Contents pg. 9 DSQ #2 pg. 16
Tree Cookie Lab pg. 20
Climate Notes pg. 19
HW:
Climate Test Friday!

9. Daily Science Question and Answer (Write Question and Answer)
1/15/13 pg. 16
Question:
What is the difference between weather and climate?
Answer:

10. What is the difference between weather and climate?
Weather- the atmospheric conditions of a specific (day to day) time period. Climate- the average atmospheric conditions of a region over a longer (30 years) period of time.

11. Growth Rings
The growth rings in a tree don't all look the same. This is because climate and other things going on in the environment affect a trees' growth. The temperature, amount of rain, what the soil is like, wind, sunlight, amount of snow on the ground and insects all affect how a tree grows. These things are different from year to year.

12. Scientists Studying Growth Rings
To study tree rings scientists looks at something called a "cross- section."
By cutting right through a tree. See all of the rings from each year of the tree's life. Just imagine looking down at a stump of a tree.
The tree's age can be figured out by counting the pairs of light and dark rings. It's easier to see the dark rings so they are usually the ones used for counting.

13. Your Turn
1. Start with the first dark ring in the center and count out to the last dark ring before the bark.
2. To help figure out what climate the tree grew in and what the environment was like look at each ring:

14. Thickness: How wide a ring is can tell you if the environment was good or bad for the tree to grow in. In years when the amount of rain and temperature were good a tree's rings are wider. In bad years a tree's rings are thinner.
Shape: If rings start to become thinner on one side than the other it probably means the tree is leaning over to one side. High winds or a big storm can cause a tree to lean.
Strange marks, like scars, and other "pieces of evidence." Scars can be left by insects or disease. A forest fire can leave burnt marks.

15. Tree Cookie Lab
Predicted Age:
Observe the rings. How do they look? Do you see a pattern? What do they tell us about the tree?
Predicted Events Affecting the growth rate of this tree (climate & environment it grew in, pests, diseases? Fire?):

16. Compare your tree ring to another group. How are they alike
Compare your tree ring to another group. How are they alike? How are they different?
Is it likely to be more important to sample trees in the area that are quite old or ones that are fairly young? Why?