Biology: The Unity and Diversity of Life (MindTap Course List)
Biology: The Unity and Diversity of Life (MindTap Course List)
14th Edition
ISBN: 9781305073951
Author: Cecie Starr, Ralph Taggart, Christine Evers, Lisa Starr
Publisher: Cengage Learning
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Chapter 19, Problem 1DAA

The Changing Earth Studies of ancient rocks and fossils can reveal changes that have taken place during Earth’s existence. FIGURE 19.13 shows how asteroid impacts and the composition of the atmosphere are thought to have changed over time. Use this figure and information in the chapter to answer the following questions.

Chapter 19, Problem 1DAA, The Changing Earth Studies of ancient rocks and fossils can reveal changes that have taken place

FIGURE 19.13 Charges in the abundance of asteroid impacts (green), atmosphere carbon dioxide concentration (pink), and atmospheric oxygen (blue) over geologic time.

1. Which occurred first, a decline in asteroid impacts, or a rise in the atmospheric level of oxygen (O2)?

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