The Mid-Atlantic Ridge.
Diverging Plate Boundary
Divergent Boundaries happen when two plates (oceanic or contental) begin to diverge, or move apart. Convergent Boundaries occur when two plates (again, oceanic or contential) begin to converge or move apart
where two plates pull apart from each other at oceanic ridges
Divergent plate boundaries form once two plates begin to pull apart from each other.
at a divergent plate boundary
Divergent plate boundary
When two oceanic plates move apart, a divergent boundary is created. As they separate, magma rises from the mantle to fill the gap, solidifying and forming new oceanic crust. This process is known as seafloor spreading and occurs along mid-ocean ridges.
When to plates pull apart on the ocean floor it's called "Tectonic Plate Drift or, "Contenetial Drift." This allows countries to move centimeters every year in any direction the plate travel. Sometimes the plates rub and can cause earthquakes ,volcanos or tsunamis.
The rift valley along a mid-ocean ridge marks where tectonic plates are moving apart. As the plates separate, magma rises to fill the gap, creating new oceanic crust. This process is known as seafloor spreading.
The thing that causes oceanic trenches would be two ocean plates pulling apart. This would leave a space in between the plates that is the trench.
When two lithospheric plates move apart, a divergent boundary is formed. This process results in the creation of new oceanic crust as magma rises to fill the gap between the plates, forming a mid-ocean ridge.
Those are earthquakes