2:53 12 Question 6 ABG During the 1960s, geologists used seismometers to record information that suggested Earth's plates were in motion. The data recovered by the seismometers showed that earthquakes, volcanoes, and other geologic features tend to occur or be present A. around the centers of tectonic plates. B. on the edges of tectonic plates. C. in Earth's outer core. D. in Earth's inner core. © 2025 Renaissance Learning, Inc. All rights reserved. testing.illuminateed.com

The correct answer is: **B. on the edges of tectonic plates.** **Explanation:** During the 1960s, seismic data collected by seismometers provided strong evidence for the theory of plate tectonics. This data showed that most earthquakes, volcanic activity, and other geologic features are concentrated along the boundaries of tectonic plates. These edges are regions where plates interact, leading to movements such as collisions, separations, or sliding past one another, which in turn cause the observed geologic activity. **Key Points:** - **Plate Boundaries:** Areas where tectonic plates meet are hotspots for geological activity. - **Types of Boundaries:** - **Convergent Boundaries:** Plates move towards each other, causing earthquakes and volcanic activity. - **Divergent Boundaries:** Plates move apart, leading to the formation of new crust and volcanic activity. - **Transform Boundaries:** Plates slide past each other, resulting in earthquakes. Understanding that most earthquakes and volcanic activities occur at these boundaries helps geologists map plate movements and predict geological events.