Are you ready for the quiz?

1
Are you ready for the quiz?

• Review yesterdays notes in interactive notebook.
• Practice with objectives 1-4.

2
Climate on a geologic scale WAAAAY back in
the day!
3
First, try this

• Take the average of the following numbers 100,
  0
• Take the average of 100,100,100,100,100,100,100,10
  0,100, 0
• (thats 9 sets of 100)

4
How does having more data affect an average?

• Your GPA is a lot harder to change than a
  progress report grade.

5
Use your graph-reading skills to complete the
worksheet
6
Interactive notebook New page

• Title Historical Climate
• Date April 14
• Cut out Graph A and glue it onto the right side.
  Leave space below for notes
• Title the graph Historical Climate Change

7
Graph Three important inferences

• Climate change is natural on Earth
• 100,000 year cycles between glacial maximum (ice
  age) and interglacial periods (maximum warmth)
• A change in -3oC can create an ice age

8
A change of 1o is significant

• Global average temperature 59oF
• Current CO2 concentration 398ppm
• (changing your GPA is much harder than changing a
  progress report average in one class)

9
Observations?
10
Milankovitch cycles

• Combination of these effects creates 100,000 year
  cycle of warming and cooling

11
Ice core sampling
12
(No Transcript)
13
We are changing the carbon cycle burning
ancient carbon (fossil fuels) moves C into the
air.
14
(No Transcript)
15
Climate and civilization

• Human civilizations change when climate changes
• Farming relies on predictable weather

16
Mayan civilization collapses suddenly 950 CE
(common era used to be called AD)Leif Erikson
950 CE sails to Greenland
17
Black Death in Europe famine 1315-1317 needed
to import grain from ChinaLittle Ice age
1550-1850 Irish Potato Famine
18
Dust Bowl 1930s

• drought poor farming practices

19
Wrap it up!

• Which is surprising to climatologists that the
  climate changes or the current rate of change?
• Has climate always been the same on Earth?
• What are Milankovitch cycles?
• How do we depend on predictable climate?