Question

which plate boundary is correctly matched with its associated geological activity?
○ divergent boundary: frequent earthquakes but no volcanic activity
○ convergent boundary: both volcanic activity and frequent earthquakes
○ transform boundary: formation of mid - ocean ridges
○ divergent boundary: formation of deep ocean trenches

Explanation:

• Divergent boundary: At divergent boundaries, tectonic plates move apart. New crust is formed as magma rises to fill the gap. This leads to the formation of mid - ocean ridges. There is frequent volcanic activity (as magma is involved in creating new crust) and also earthquakes (due to the movement of plates).
• Convergent boundary: Here, plates move towards each other. One plate may be subducted (forced below another). This can lead to the formation of deep - ocean trenches (when an oceanic plate is subducted beneath another plate). There is both volcanic activity (as subducted material can melt and rise) and frequent earthquakes (due to the intense plate interactions).
• Transform boundary: Plates slide past each other horizontally. This mainly causes earthquakes (due to the frictional and shearing forces as plates move) but there is no significant volcanic activity (as there is no large - scale magma involvement related to plate creation or subduction).

Answer:

D. Divergent boundary: frequent earthquakes but no volcanic activity