What geologic events occur at divergent boundaries?
The Earth's surface is made up of numerous geologic plates that are constantly moving over a ductile mantle. The boundaries between these plates are defined by the plates' movement relative to each other, and some of the most active geologic events occur at these boundaries. A divergent boundary is defined by two plates moving away from each other. A convergent boundary is defined by two plates moving towards each other. A transform boundary is defined by two plates moving laterally from each other; this movement is perpendicular to the first two boundary movements. In reality, plate boundaries are not strictly one definite boundary or another, they are often a combination of a convergent or a divergent and a transform boundary.
Answer and Explanation:
Divergent plate boundaries are defined by two plates moving apart from each other. As the plates move apart, an area of low pressure is generated between the two, and mantle material begins to rise up through the crust. This creates a long uplifted ridge marked by submarine volcanoes along the divergent boundary; an example of this is the mid-Atlantic ridge where the North American and Eurasian plates are diverging from each other. Along these boundaries, there is also marked seismic activity occurring due to the plates spreading apart form one another. To summarize, divergent boundaries are defined by volcanic activity and earthquakes.
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from CLEP Natural Sciences: Study Guide & Test PrepChapter 11 / Lesson 9