Many planets, one earth

Annenberg Learner (Firm) (Added Author).

Summary: The early Earth was a much different planet than the one we know today. Ancient rocks provide evidence of the emergence of oxygen in the atmosphere and of a frozen Snowball Earth. Scientists Paul Hoffman and Andrew Knoll look at these clues to help explain the rise of complex animal life.

Record details

Physical Description: 1 videodisc (30 minutes) : sound, color, 4 3/4 inches.
videodisc
Publisher: [Place of publication not identified] : Annenberg Learner (Firm), [2007]
Distributor: New York, N.Y. : Distributed by Films Media Group, 2015.

Content descriptions

General Note:	Originally released by Annenberg Learner (Firm), 2007.
Formatted Contents Note:	Introduction: Many Planets, One Earth: The Habitable Planet (1:44) -- Rise of Oxygen (2:51) -- Geologic Signatures of Bacteria (3:50) -- Organic Chemistry (3:01) -- Fossil Records (1:51) -- Snowball Earth (3:09) -- Global Thermostat (4:15) -- Paradox of Glaciations (2:49) -- Driving the Carbon Cycle (3:14) -- Credits: Many Planets, One Earth: The Habitable Planet-A Systems Approach to Environmental Science (0:51).
Target Audience Note:	9 & up.
Language Note:	Closed-captioned.