Final answer:
The long, linear rise in the sea-floor with earthquakes and volcanic activity is a characteristic of a divergent boundary, typically found at mid-ocean ridges where tectonic plates are moving apart.
Step-by-step explanation:
The long, linear rise in the sea-floor with associated earthquakes and volcanic activity found along its ridge is indicative of a divergent boundary.
At divergent boundaries, tectonic plates move away from each other, allowing magma from the mantle to rise and form new crust, often resulting in mid-ocean ridges. These areas can experience shallow earthquakes and some volcanic activity due to the upwelling of magma.
Unlike convergent boundaries, which can produce deep earthquakes and have subduction zones where one plate is forced under another, or transform boundaries that usually feature shallow earthquakes without volcanism, divergent boundaries create new seafloor and are typically associated with mid-ocean ridges.
Geologists and students can study maps showing the distribution of earthquakes and volcanoes to identify the major plate boundaries.
Specifically, divergent boundaries are predominantly found in ocean basins and are mostly characterized by mid-ocean ridges.