Are you ready for the quiz? Review yesterday’s notes in interactive notebook. Practice with...
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Transcript of Are you ready for the quiz? Review yesterday’s notes in interactive notebook. Practice with...
Are you ready for the quiz?
Review yesterday’s notes in interactive notebook.
Practice with objectives #1-4.
Climate – on a geologic scale – WAAAAY back in the day!
First, try this:
Take the average of the following numbers: 100, 0
Take the average of 100,100,100,100,100,100,100,100,100,& 0
(that’s 9 sets of 100)
How does having more data affect an average?Your GPA is a lot harder to change than a progress report grade.
Use your graph-reading skills to complete the worksheet
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
*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
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)
Observations?
*Milankovitch cycles
Combination of these effects creates 100,000 year cycle of warming and cooling
Earth’s orbitaround the sun
Ice core sampling
We are changing the carbon cycle – burning ancient carbon (fossil fuels) moves C into the air.
*Climate and civilization
Human civilizations change when climate changes
Farming relies on predictable weather
Mayan civilization – collapses suddenly 950 CE (common era – used to be called AD)
Leif Erikson – 950 CE sails to Greenland
Black Death in Europe – famine 1315-1317 – needed to import grain from China
Little Ice age – 1550-1850Irish Potato Famine
Dust Bowl – 1930’s
drought+ poor farming practices
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?