Extinction Markers Multiple Choices

Mass extinctions may have been devastating for life on Earth, but they also help scientists divide Earth’s history into major chapters. This reading passage explains how large extinction events mark important turning points in the geologic time scale. Students learn how scientists study fossils before and after these events to identify when one era ended and another began. Famous examples, including the extinction of the dinosaurs, help readers understand how Earth’s plants, animals, and environments have changed through millions of years.

This worksheet builds strong informational reading skills by helping students recognize cause-and-effect relationships, identify key ideas, and connect evidence across multiple paragraphs. Vocabulary such as mass extinction, geologic era, fossil record, species, climate change, and Cenozoic strengthens scientific literacy without overwhelming young learners. Written in a warm, teacher-friendly voice, the passage helps students see that even Earth’s greatest challenges have left behind valuable clues that continue to teach us about our planet today.