Question

Which geological activity is common at both convergent (e.g., continental-to-continental) and divergent (e.g., oceanic-to-oceanic) plate boundaries?
new crust formation
earthquakes
subduction
crust is re-melted and recycled into the Earth's mantle

Answer 1

The geological activity that is common at both convergent (e.g., continental-to-continental) and divergent (e.g., oceanic-to-oceanic) plate boundaries is **earthquakes**.

While divergent boundaries are characterized by new crust formation, and convergent boundaries can involve processes like subduction and recycling of crust into the mantle, both types of boundaries can experience earthquakes as a result of the movement and interaction of tectonic plates.