Respuesta :
Answer:
they move apart
Explanation:
when two tectonic plates move apart it causes a trench this is most common in oceans
Answer:In particular, ocean trenches are a feature of convergent plate boundaries, where two or more tectonic plates meet. At many convergent plate boundaries, dense lithosphere melts or slides beneath less-dense lithosphere in a process called subduction, creating a trench
Explanation: