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?