Extras  Study Guide

Chapter 2 Digging into the Past
  1. The Earth's landscape is shaped by tectonic movements over geologic time.
  2. During the Silurian-Devonian periods, much of North America lay under a tropical sea.
  3. The sea retreated by the Carboniferous period, allowing land plants to thrive.
  4. Insects led animal colonization of land, followed by amphibians and other vertebrates in the Permian period.
  5. The Permian period was followed by the Triassic, beginning the age of reptiles - especially dinosaurs.
  6. Global climate began to cool during the Tertiary period.
  7. Continued cooling triggered a series of Ice Ages in the Quaternary period.
  8. The North American prairies evolved during the current interglacial.
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