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Copyright © 2005 Pearson Education, Inc. publishing as Benjamin Cummings
Presentation prepared by Andrew Stull
Biology Lecture Launchers from Benjamin Cummings and Discovery Channel School
Early LifeEarly Life
Chemistry and the Early Earth
Copyright © 2005 Pearson Education, Inc. publishing as Benjamin Cummings
What evidence can we examine today to learn about the
early Earth?
Early Life
Copyright © 2005 Pearson Education, Inc. publishing as Benjamin Cummings
Early Life
Copyright © 2005 Pearson Education, Inc. publishing as Benjamin Cummings
What evidence can we examine today to learn about the
early Earth?
Early Life
Copyright © 2005 Pearson Education, Inc. publishing as Benjamin Cummings
Early Life
Checkpoint
How long ago do scientist believe life first began on Earth?
a. 4.5 billion yearsb. 3.7 billion yearsc. 500 million yearsd. 25 million yearse. 1 million years
Copyright © 2005 Pearson Education, Inc. publishing as Benjamin Cummings
Early Life
Checkpoint
How long ago do scientist believe life first began on Earth?
b. 3.7 billion years
Copyright © 2005 Pearson Education, Inc. publishing as Benjamin Cummings
Checkpoint
Early Life
What process produces Earth’s atmospheric oxygen?
a. solar radiationb. meteoric bombardmentc. photosynthesisd. oxidatione. none of the above
Copyright © 2005 Pearson Education, Inc. publishing as Benjamin Cummings
Checkpoint
Early Life
What process produces Earth’s atmospheric oxygen?
c. photosynthesis
Copyright © 2005 Pearson Education, Inc. publishing as Benjamin Cummings
Checkpoint
Early Life
What evidence points to the date of the appearance of the first oxygen-producing organisms?
a. the depth at which extremophiles are foundb. the temperature at which extremophiles livec. iron oxides in rockd. the ozone layere. none of the above
Copyright © 2005 Pearson Education, Inc. publishing as Benjamin Cummings
Checkpoint
Early Life
What evidence points to the date of the appearance of the first oxygen-producing organisms?
c. iron oxides in rock
Copyright © 2005 Pearson Education, Inc. publishing as Benjamin Cummings
Biology and Society
Early Life
Living organisms have altered the environment in the past. What
evidence do we have that living organisms continue to do so today?
Copyright © 2005 Pearson Education, Inc. publishing as Benjamin Cummings
Internet Research
Early Life
Tango in the Atmosphere: Ozone & Climate Change(http://earthobservatory.nasa.gov/Study/Tango/) This article offers an overview of ozone chemistry and its importance to Earth’s climate. The author says that scientists project that the ozone hole might eventually be repaired. List the conditions that need to occur for a successful repair of the ozone hole.
Atmospheric Carbon Dioxide Record from Mauna Loa(http://cdiac.esd.ornl.gov/trends/co2/sio-mlo.htm) This article describes a 45-year program to monitor atmospheric carbon dioxide. Read the article and then review the data graph (http://cdiac.esd.ornl.gov/trends/co2/graphics/mlo144e.pdf). With the data in this graph, what prediction would you make?
National Atmospheric Deposition Program(http://nadp.sws.uiuc.edu/) This site describes efforts to monitor the chemicals that contribute to acid rain. Review the animated maps (http://nadp.sws.uiuc.edu/amaps/) and describe the trends in chemical deposition across the United States from 1985 to 2001.
Copyright © 2005 Pearson Education, Inc. publishing as Benjamin Cummings
Summary
Early Life
• The Earth is dynamic and ever changing.• Early life is believed to have originated under
anoxic conditions.• Oxygen wastes given off by early life helped to
form our oxygen-rich atmosphere.• Iron oxide deposits in ancient rock are evidence of
early life.• Life continues to affect the Earth.
Copyright © 2005 Pearson Education, Inc. publishing as Benjamin Cummings
Organisms metabolize, reproduce, adapt, and—along the way—change the Earth.
How do you change the Earth and can you adapt to those
changes?
Early Life
