SECTION

DATASHEET CHAPTER 1 Earth’s Changing Atmosphere

1.3 Investigate Greenhouse Gases How have levels of greenhouse gases changed? MATERIALS CO2 table

sheet, graph sheet, regular pencil, red pencil

PROCEDURE

! Plot the data for CO2 levels on the graph sheet, using a regular pencil. Draw line segments to connect the points. @ Plot the temperatures on the same graph, using a red pencil. Draw red line segments to connect the points.

INTERPRET DATA

Copyright © by McDougal Littell, a division of Houghton Mifflin Company

How many times during the past 400,000 years were average temperatures in Antarctica above ⫺56°C?

Do these changes seem to be connected to changes in carbon dioxide? Explain.

CHALLENGE

Is it possible to tell from the graph whether temperature affected carbon dioxide levels or carbon dioxide levels affected temperature? Why or why not?

EARTH’S ATMOSPHERE, CHAPTER 1, LAB DATASHEET 43

043-043-sean-urb-d0103-dsi 43

3/4/04, 2:23:44 PM

EA 1.3 Investigate Greenhouse Gases Data Sheet.pdf

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